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These are the user uploaded subtitles that are being translated: 1 00:00:02,570 --> 00:00:03,602 Narrator: The pantheon, 2 00:00:04,972 --> 00:00:08,474 Ancient rome's best preserved monument, 3 00:00:08,576 --> 00:00:10,876 An engineering wonder 4 00:00:10,978 --> 00:00:14,980 Unrivaled in its scale and pioneering construction. 5 00:00:15,082 --> 00:00:16,582 Many scholars think it's 6 00:00:16,684 --> 00:00:19,018 The most extraordinary building ever built. 7 00:00:19,120 --> 00:00:21,820 Narrator: Buried inside this mighty edifice 8 00:00:21,922 --> 00:00:23,722 Is an ancient mystery. 9 00:00:23,824 --> 00:00:26,125 This tunnel is part of 10 00:00:26,227 --> 00:00:30,362 A very extensive network that runs for kilometers. 11 00:00:30,464 --> 00:00:33,766 Narrator: Now, new evidence beneath the streets of rome 12 00:00:33,868 --> 00:00:35,734 Reveals clues. 13 00:00:35,836 --> 00:00:39,138 The travertine slabs are a window into 14 00:00:39,240 --> 00:00:41,173 What this area may have looked like. 15 00:00:41,275 --> 00:00:43,842 Narrator: How do the ancient engineers build 16 00:00:43,944 --> 00:00:47,846 Its impossible dome, with a gaping hole in the center? 17 00:00:47,948 --> 00:00:51,050 And can pioneering 3-d scanning 18 00:00:51,152 --> 00:00:53,886 Reveal who builds this ancient wonder? 19 00:00:53,988 --> 00:00:55,954 We can see the fingerprints 20 00:00:56,057 --> 00:00:58,057 Of this emperor in the pantheon. 21 00:00:59,827 --> 00:01:01,660 Narrator: To unlock the mysteries of 22 00:01:01,762 --> 00:01:04,630 Ancient rome's greatest mega structure, 23 00:01:04,732 --> 00:01:07,199 We unearth its foundations. 24 00:01:09,370 --> 00:01:13,105 We digitally deconstruct its mighty dome roof 25 00:01:13,207 --> 00:01:16,175 And piece together clues at its feet 26 00:01:18,679 --> 00:01:21,213 To decode the greatest secrets of this 27 00:01:21,315 --> 00:01:24,550 Incredible monument and the city around it. 28 00:01:24,652 --> 00:01:31,657 ♪♪ 29 00:01:33,494 --> 00:01:37,463 Rome, the capital of one of the greatest empires 30 00:01:37,565 --> 00:01:39,031 In history. 31 00:01:39,133 --> 00:01:42,601 Its ancient roots are evident throughout the city. 32 00:01:44,939 --> 00:01:47,639 Every structure is a vital clue 33 00:01:47,741 --> 00:01:50,676 To the mysterious world of the romans. 34 00:01:53,848 --> 00:01:56,181 Right at the heart of the city stands 35 00:01:56,283 --> 00:01:59,284 The best preserved roman monument in the world, 36 00:02:01,122 --> 00:02:03,722 The pantheon. 37 00:02:03,824 --> 00:02:06,425 Surviving for 2,000 years, 38 00:02:06,527 --> 00:02:08,260 It's a miracle of engineering. 39 00:02:11,699 --> 00:02:15,167 The pantheon is an iconic roman building. 40 00:02:15,269 --> 00:02:18,170 In fact, it's one of the most famous in the world. 41 00:02:18,272 --> 00:02:19,738 Many scholars think it's 42 00:02:19,840 --> 00:02:22,875 The most extraordinary building ever built, 43 00:02:22,977 --> 00:02:26,411 And it's even more impressive when you think that it was 44 00:02:26,514 --> 00:02:28,547 Designed and built 2,000 years ago 45 00:02:28,649 --> 00:02:30,682 Without any of the advantages of modern 46 00:02:30,784 --> 00:02:32,784 Technology that we have today. 47 00:02:34,989 --> 00:02:37,256 Narrator: Today, this extraordinary monument 48 00:02:37,358 --> 00:02:40,893 Captivates millions of people who come to visit each year. 49 00:02:44,031 --> 00:02:47,633 16 towering columns flank the entrance, 50 00:02:47,735 --> 00:02:50,035 Topped with marble capitals. 51 00:02:50,137 --> 00:02:53,038 Each one is carved from a single piece of granite. 52 00:02:55,342 --> 00:02:58,510 Inside, the exquisitely decorated circular 53 00:02:58,612 --> 00:03:01,046 Interior is designed to impress, 54 00:03:02,716 --> 00:03:04,683 And its 20-foot-thick walls 55 00:03:04,785 --> 00:03:07,619 Are built to stand for millennia. 56 00:03:07,721 --> 00:03:11,523 The roof is the largest dome of its kind, 57 00:03:11,625 --> 00:03:16,028 Over 140 feet wide, with a 30-foot hole in the middle. 58 00:03:17,998 --> 00:03:20,265 Despite its venerable age, 59 00:03:20,367 --> 00:03:25,304 To this day, the monument's true purpose is a mystery. 60 00:03:29,276 --> 00:03:31,610 Valerie higgins spends her life 61 00:03:31,712 --> 00:03:34,680 Decoding the mysteries of ancient rome, 62 00:03:34,782 --> 00:03:38,083 And none are more enigmatic than the pantheon. 63 00:03:40,588 --> 00:03:44,056 The name pantheon implies that, at some point in the history of 64 00:03:44,158 --> 00:03:45,457 This building, 65 00:03:45,559 --> 00:03:49,161 It was a temple dedicated to all the gods, 66 00:03:49,263 --> 00:03:51,863 Most particularly, the 12 olympian gods 67 00:03:51,966 --> 00:03:54,066 Who were the most prestigious. 68 00:03:54,168 --> 00:03:58,237 Narrator: The word pantheon means "temple of all the gods," 69 00:03:58,339 --> 00:03:59,905 But the pantheon's design 70 00:04:00,007 --> 00:04:02,374 Is far from that of a typical temple. 71 00:04:02,476 --> 00:04:05,244 When you look at it from this angle, 72 00:04:05,346 --> 00:04:07,846 It just looks like a typical temple, a huge, 73 00:04:07,948 --> 00:04:09,248 Enormous temple. 74 00:04:09,350 --> 00:04:12,618 Behind it is this massive circular 75 00:04:12,720 --> 00:04:16,021 Drum that we call the rotunda, 76 00:04:16,123 --> 00:04:18,624 And you think, "that shouldn't be on the back of a temple." 77 00:04:20,094 --> 00:04:22,628 Narrator: Most roman temples are rectangular. 78 00:04:24,198 --> 00:04:27,833 Instead, the pantheon's combination of an angular front 79 00:04:27,935 --> 00:04:31,570 And a curved rotunda at the back is completely unique. 80 00:04:32,773 --> 00:04:34,573 Higgins: This isn't any temple. 81 00:04:34,675 --> 00:04:37,576 This is something that's extraordinary. 82 00:04:37,678 --> 00:04:40,045 Narrator: The pantheon's true purpose 83 00:04:40,147 --> 00:04:42,714 Has puzzled archaeologists for centuries, 84 00:04:45,185 --> 00:04:48,687 But now, intriguing new clues have appeared around 85 00:04:48,789 --> 00:04:51,690 This monument that could help crack the mystery. 86 00:04:53,560 --> 00:04:56,762 Just a few months ago, a water pipe burst. 87 00:04:56,864 --> 00:04:58,363 It created a sinkhole. 88 00:04:58,465 --> 00:05:01,700 The cobblestones and the earth caved in. 89 00:05:01,802 --> 00:05:03,168 What they revealed 90 00:05:03,270 --> 00:05:07,339 Were paving stones that were connected to the pantheon. 91 00:05:10,210 --> 00:05:12,844 Narrator: The sinkhole unearths a time capsule. 92 00:05:14,615 --> 00:05:17,249 Just a few feet beneath the modern piazza 93 00:05:17,351 --> 00:05:21,320 Are travertine paving slabs from an ancient roman square. 94 00:05:24,625 --> 00:05:27,993 Following these puzzle pieces to the pantheon, 95 00:05:28,095 --> 00:05:30,762 Archaeologists make an incredible discovery... 96 00:05:34,368 --> 00:05:37,769 A marble staircase leading up to a platform 97 00:05:37,871 --> 00:05:40,839 And the remains of columns that are as old 98 00:05:40,941 --> 00:05:42,974 As the paving slabs. 99 00:05:43,077 --> 00:05:46,311 Can these buried stones help reveal 100 00:05:46,413 --> 00:05:48,480 The true purpose of the pantheon? 101 00:05:48,582 --> 00:05:54,086 ♪♪ 102 00:05:54,188 --> 00:05:57,122 Paolo carafa investigates the mysterious 103 00:05:57,224 --> 00:05:59,257 Remains of this older building. 104 00:05:59,360 --> 00:06:03,028 The pantheon we see today is the last chapter 105 00:06:03,130 --> 00:06:04,296 Of a long history. 106 00:06:04,398 --> 00:06:07,132 Our work has been to reconstruct 107 00:06:07,234 --> 00:06:09,101 Such a long history. 108 00:06:09,203 --> 00:06:12,204 Narrator: Paolo and his team create a comprehensive map 109 00:06:12,306 --> 00:06:14,940 Of all the archaeological discoveries beneath 110 00:06:15,042 --> 00:06:16,708 The pantheon. 111 00:06:16,810 --> 00:06:20,712 All these clues placed on a much more accurate map, 112 00:06:20,814 --> 00:06:24,750 Reveal a structure exactly similar to the pantheon 113 00:06:24,852 --> 00:06:26,017 We see today. 114 00:06:27,421 --> 00:06:30,155 The bulk of the structures were part of 115 00:06:30,257 --> 00:06:31,289 The original pantheon. 116 00:06:35,596 --> 00:06:38,797 Narrator: The existence of an older, original pantheon 117 00:06:38,899 --> 00:06:41,233 Underneath the pantheon we see today 118 00:06:41,335 --> 00:06:43,001 Is an astonishing discovery. 119 00:06:44,872 --> 00:06:46,571 Paolo's research reveals 120 00:06:46,673 --> 00:06:50,976 The original pantheon is built around 27 b.C. 121 00:06:51,078 --> 00:06:53,412 His work leads to the man who built it. 122 00:06:54,481 --> 00:06:56,882 According to the literary sources, 123 00:06:56,984 --> 00:07:01,052 The original pantheon is created by the first emperor of 124 00:07:01,155 --> 00:07:03,722 The roman empire, augustus. 125 00:07:03,824 --> 00:07:06,858 Narrator: Why does augustus build this first pantheon? 126 00:07:10,130 --> 00:07:14,232 Valerie believes she can find clues in the surrounding city. 127 00:07:14,334 --> 00:07:16,268 So here we are in the heart of rome. 128 00:07:16,370 --> 00:07:18,804 It's full of buildings, it's full of people. 129 00:07:18,906 --> 00:07:20,305 But it isn't in the least bit 130 00:07:20,407 --> 00:07:23,074 As it would have been at the time of the first pantheon. 131 00:07:24,411 --> 00:07:26,344 Narrator: To investigate the ancient area, 132 00:07:26,447 --> 00:07:30,248 Valerie compares today's map of rome with a map of the city 133 00:07:30,350 --> 00:07:32,317 2,000 years ago. 134 00:07:32,419 --> 00:07:34,986 We can see the pantheon here. 135 00:07:35,088 --> 00:07:37,722 At the time of augustus, you wouldn't have seen 136 00:07:37,825 --> 00:07:42,093 Anything in this area except the mausoleum of augustus. 137 00:07:43,597 --> 00:07:45,797 Narrator: Valerie suspects there is a connection 138 00:07:45,899 --> 00:07:47,432 Between these two monuments, 139 00:07:47,501 --> 00:07:51,336 And that augustus's mausoleum is a clue to the purpose 140 00:07:51,438 --> 00:07:53,371 Of his original pantheon. 141 00:07:55,175 --> 00:07:57,609 Valerie has obtained rare permission to 142 00:07:57,711 --> 00:08:01,546 Launch a drone-mounted camera above rome. 143 00:08:01,648 --> 00:08:03,482 She wants to investigate the layout 144 00:08:03,584 --> 00:08:06,151 Of the two monuments from the air. 145 00:08:06,253 --> 00:08:09,888 If we take a drone to go up and to fly over the top, 146 00:08:09,990 --> 00:08:12,324 We can have a look at how these structures 147 00:08:12,426 --> 00:08:13,592 Relate to each other. 148 00:08:15,629 --> 00:08:18,630 Narrator: Valerie searches for the mausoleum. 149 00:08:18,732 --> 00:08:21,132 From the site of the original pantheon, 150 00:08:21,235 --> 00:08:24,202 The drone flies north over the rooftops of rome. 151 00:08:24,304 --> 00:08:30,509 ♪♪ 152 00:08:30,611 --> 00:08:33,245 Valerie locates augustus's mausoleum 153 00:08:33,347 --> 00:08:35,413 Half a mile north of the pantheon. 154 00:08:37,518 --> 00:08:40,218 Its huge circular structure makes it easily 155 00:08:40,287 --> 00:08:43,455 Identifiable even from 200 feet in the air. 156 00:08:45,759 --> 00:08:47,492 The eye in the sky reveals 157 00:08:47,594 --> 00:08:51,129 The two giant circular monuments are perfectly aligned. 158 00:08:52,299 --> 00:08:55,066 Higgins: The pantheon and the mausoleum of augustus 159 00:08:55,168 --> 00:08:57,402 Appear to be facing each other, 160 00:08:57,504 --> 00:09:00,505 And they are linked along a visual axis. 161 00:09:00,574 --> 00:09:04,509 Narrator: What more can the connection reveal? 162 00:09:04,611 --> 00:09:07,512 Valerie heads to the mausoleum 163 00:09:07,614 --> 00:09:09,514 Of augustus to investigate. 164 00:09:11,084 --> 00:09:14,619 It is one of the largest tombs in the world. 165 00:09:14,721 --> 00:09:18,156 This mausoleum tells us quite a lot about augustus. 166 00:09:18,258 --> 00:09:22,127 He's founding a big imperial rome. 167 00:09:22,229 --> 00:09:23,795 This monument was built to be 168 00:09:23,897 --> 00:09:27,065 A permanent memorial to him and his achievements. 169 00:09:28,502 --> 00:09:31,436 Narrator: Valerie believes the mausoleum and the pantheon 170 00:09:31,538 --> 00:09:34,272 Are connected as part of an imperial design. 171 00:09:36,209 --> 00:09:40,879 Having a pantheon facing the mausoleum that 172 00:09:40,981 --> 00:09:42,714 He and the rest of his family 173 00:09:42,816 --> 00:09:45,951 Are going to be buried in indicate that they have 174 00:09:46,053 --> 00:09:48,019 A very special status. 175 00:09:48,121 --> 00:09:50,722 He is laying the foundations 176 00:09:50,824 --> 00:09:54,459 For acceptance of a new form 177 00:09:54,561 --> 00:09:56,795 Of government, of an emperor. 178 00:09:56,897 --> 00:09:58,763 Narrator: The mausoleum's perfect alignment 179 00:09:58,865 --> 00:10:00,665 With the pantheon reveals 180 00:10:00,767 --> 00:10:03,668 The original pantheon's true purpose. 181 00:10:03,770 --> 00:10:06,671 Both buildings are tributes to augustus, 182 00:10:06,773 --> 00:10:09,541 Where he can be worshiped and venerated forever. 183 00:10:11,378 --> 00:10:14,512 So why do the ruins of his original pantheon 184 00:10:14,615 --> 00:10:17,048 Lie beneath the building we see today? 185 00:10:17,150 --> 00:10:22,153 ♪♪ 186 00:10:22,255 --> 00:10:25,991 In 80 a.D., fire breaks out in rome. 187 00:10:26,093 --> 00:10:28,560 It burns for three days, 188 00:10:28,662 --> 00:10:31,096 Devastating the area around the pantheon. 189 00:10:34,434 --> 00:10:37,435 The fire spreads from building to building, 190 00:10:37,537 --> 00:10:39,604 Engulfing the original pantheon, 191 00:10:39,706 --> 00:10:42,774 Causing it to collapse. 192 00:10:42,876 --> 00:10:45,076 The romans restore the pantheon 193 00:10:45,178 --> 00:10:46,444 To its former glory, 194 00:10:48,348 --> 00:10:49,914 But in 110 a.D., 195 00:10:50,017 --> 00:10:52,050 Lightning strikes and destroys it. 196 00:10:55,555 --> 00:10:59,324 The rubble is cleared, and the present pantheon is built. 197 00:11:01,995 --> 00:11:06,431 The original pantheon is buried, but not forgotten. 198 00:11:06,533 --> 00:11:10,068 The new version stands boldly in its place. 199 00:11:10,170 --> 00:11:13,071 But who builds this new pantheon? 200 00:11:21,548 --> 00:11:24,949 Narrator: The pantheon, built on top of an older 201 00:11:25,052 --> 00:11:30,055 Temple to honor the first emperor of rome, augustus. 202 00:11:30,157 --> 00:11:33,124 But who builds the new pantheon we see today? 203 00:11:35,362 --> 00:11:37,862 Valerie higgins believes that clues in 204 00:11:37,998 --> 00:11:41,933 The structure will reveal the creator of this masterpiece. 205 00:11:42,035 --> 00:11:44,202 Higgins: One of the first things that people notice is 206 00:11:44,304 --> 00:11:46,104 The inscription across the top, 207 00:11:46,206 --> 00:11:47,672 And that's in latin. 208 00:11:47,774 --> 00:11:49,307 It tells us that marcus agrippa 209 00:11:49,409 --> 00:11:51,843 Made this building when he was consul 210 00:11:51,945 --> 00:11:53,845 For the third time. 211 00:11:53,947 --> 00:11:57,849 Agrippa was the right-hand man of the emperor augustus, 212 00:11:57,951 --> 00:12:00,852 And we know that he was responsible 213 00:12:00,954 --> 00:12:04,589 For the original pantheon on this site. 214 00:12:05,792 --> 00:12:08,359 Narrator: Rich romans often inscribe their names 215 00:12:08,462 --> 00:12:10,528 On the civic buildings they commission. 216 00:12:12,265 --> 00:12:14,232 But something here doesn't add up. 217 00:12:15,669 --> 00:12:18,036 The pantheon we see today is built 218 00:12:18,138 --> 00:12:22,407 More than 150 years after the original structure. 219 00:12:22,509 --> 00:12:26,878 By that time, augustus and agrippa are long dead. 220 00:12:31,685 --> 00:12:33,685 Hidden in the walls of the pantheon 221 00:12:33,787 --> 00:12:36,287 Are clues to the identity of its designer. 222 00:12:39,459 --> 00:12:41,760 Tile-shaped bricks 223 00:12:41,862 --> 00:12:44,496 Carry the stamp of the manufacturer 224 00:12:46,566 --> 00:12:49,968 And the names of the highest elected officials at the time. 225 00:12:51,138 --> 00:12:53,738 Some bricks in the rotunda date 226 00:12:53,840 --> 00:12:55,673 To the reign of emperor trajan. 227 00:12:58,211 --> 00:13:01,312 But others date to the time of the emperor hadrian. 228 00:13:04,918 --> 00:13:07,352 So who, if it's not agrippa, 229 00:13:07,454 --> 00:13:10,588 Is really the builder of the pantheon we see today? 230 00:13:14,094 --> 00:13:18,730 Emperor trajan rules 84 years after augustus's death, 231 00:13:20,400 --> 00:13:21,966 But only a small number of 232 00:13:22,068 --> 00:13:24,435 The pantheon's bricks date to his reign. 233 00:13:26,706 --> 00:13:29,607 Instead, the majority of the bricks date to 234 00:13:29,709 --> 00:13:31,476 Emperor hadrian, 235 00:13:31,578 --> 00:13:35,847 Trajan's successor who rules 100 years after augustus. 236 00:13:38,985 --> 00:13:40,685 To investigate if hadrian 237 00:13:40,821 --> 00:13:42,954 Is the builder of the pantheon, 238 00:13:43,056 --> 00:13:45,757 Paolo carafa explores one of hadrian's most 239 00:13:45,859 --> 00:13:47,759 Famous creations, 240 00:13:47,861 --> 00:13:50,061 Hadrian's personal villa. 241 00:13:50,163 --> 00:13:53,798 It lies around 20 miles east of rome in tivoli 242 00:13:53,867 --> 00:13:57,936 And is the largest villa in the roman empire. 243 00:13:58,038 --> 00:13:59,871 Hadrian loved architecture. 244 00:13:59,973 --> 00:14:02,607 He trained himself as an architect. 245 00:14:02,709 --> 00:14:06,144 He had been involved in the creation of this villa. 246 00:14:06,246 --> 00:14:08,479 Narrator: But his construction projects reveal 247 00:14:08,582 --> 00:14:12,517 A much bigger ambition and pioneering ideas. 248 00:14:12,619 --> 00:14:16,120 Carafa: Hadrian had the great vision of how architecture 249 00:14:16,223 --> 00:14:18,857 Would strengthen and support his power. 250 00:14:18,959 --> 00:14:22,493 He enabled the architect to push the innovation forward 251 00:14:22,596 --> 00:14:25,797 To create a larger and more complex building 252 00:14:25,899 --> 00:14:27,198 Than ever before. 253 00:14:27,267 --> 00:14:29,234 Narrator: Here at his villa, hadrian 254 00:14:29,336 --> 00:14:32,570 Experiments with his innovative designs. 255 00:14:32,672 --> 00:14:35,673 It covers more than 300 acres 256 00:14:35,775 --> 00:14:39,477 With almost 1,000 rooms, including banqueting halls, 257 00:14:39,579 --> 00:14:42,280 Indoor and outdoor swimming pools, and even 258 00:14:42,382 --> 00:14:45,216 Underground parking for his chariots. 259 00:14:45,318 --> 00:14:48,253 Carafa: The villa was the largest private residence 260 00:14:48,355 --> 00:14:50,255 Ever built in the roman empire. 261 00:14:50,357 --> 00:14:54,325 It was twice as large as the whole city of pompeii. 262 00:14:54,427 --> 00:14:57,061 The dimension and the lavishness are a clear 263 00:14:57,163 --> 00:15:02,000 Indication of the immense power of the roman emperor. 264 00:15:02,102 --> 00:15:05,503 Narrator: Does this villa conceal evidence that reveals 265 00:15:05,605 --> 00:15:08,206 Hadrian builds the pantheon? 266 00:15:08,308 --> 00:15:09,707 To search for clues, 267 00:15:09,809 --> 00:15:12,510 Paolo heads to the maritime theater, 268 00:15:12,612 --> 00:15:16,414 Hadrian's private retreat within the grounds. 269 00:15:16,516 --> 00:15:19,217 The size of the theater is what 270 00:15:19,319 --> 00:15:24,122 Intrigues paolo and fellow archaeologist fabio cavallero. 271 00:15:25,592 --> 00:15:28,059 They use a state-of-the-art laser scanner 272 00:15:28,161 --> 00:15:29,494 To survey the site. 273 00:15:39,873 --> 00:15:42,407 Narrator: Fabio gets ready to start the scan. 274 00:15:47,280 --> 00:15:51,082 These high precision digital images allow paolo and fabio 275 00:15:51,184 --> 00:15:52,817 To compare the floor plan 276 00:15:52,919 --> 00:15:55,887 Of the pantheon to that of the maritime theater. 277 00:15:57,257 --> 00:15:59,390 What they discover is astonishing. 278 00:16:00,860 --> 00:16:03,361 Carafa: The maritime theater has the same 279 00:16:03,463 --> 00:16:05,897 Diameter of the interior of the pantheon. 280 00:16:08,501 --> 00:16:10,735 Narrator: This could be evidence that hadrian 281 00:16:10,837 --> 00:16:13,604 Is the designer of both buildings. 282 00:16:13,707 --> 00:16:16,274 To delve deeper, the team scans 283 00:16:16,376 --> 00:16:20,211 The entire villa, looking for more similarities. 284 00:16:20,313 --> 00:16:23,281 Our survey creates point clouds to 285 00:16:23,383 --> 00:16:25,817 Map every single corner of the villa. 286 00:16:27,620 --> 00:16:31,222 Narrator: The survey pinpoints a structure with a semi-dome, 287 00:16:31,324 --> 00:16:34,258 The canopus, that has even closer similarities 288 00:16:34,361 --> 00:16:35,360 With the pantheon. 289 00:16:35,462 --> 00:16:37,929 Carafa: Here we have an excellent example of 290 00:16:38,031 --> 00:16:41,966 Hadrian's experiments with domes and semi-domes. 291 00:16:42,068 --> 00:16:44,569 Narrator: These similarities are conclusive evidence 292 00:16:44,671 --> 00:16:46,838 That hadrian builds the new pantheon. 293 00:16:48,375 --> 00:16:52,110 We can see the fingerprints of this emperor 294 00:16:52,212 --> 00:16:54,445 In the pantheon and in hadrian's villa. 295 00:16:56,182 --> 00:16:58,316 Narrator: But if hadrian builds the pantheon, 296 00:16:58,418 --> 00:17:00,318 Why is augustus's friend 297 00:17:00,420 --> 00:17:02,854 Agrippa's name on the front of the building? 298 00:17:05,125 --> 00:17:07,658 Valerie thinks a clue may lie in what 299 00:17:07,761 --> 00:17:10,962 Romans think of hadrian and his great predecessor. 300 00:17:12,232 --> 00:17:15,500 Higgins: Hadrian was quite disliked in his own time. 301 00:17:15,602 --> 00:17:18,870 By the second century, people are thinking that 302 00:17:18,972 --> 00:17:22,740 Nobody since augustus had really matched up to him. 303 00:17:27,213 --> 00:17:29,647 Narrator: The romans see augustus as the epitome 304 00:17:29,749 --> 00:17:31,816 Of a successful leader. 305 00:17:31,918 --> 00:17:36,721 In 27 b.C., he becomes the very first emperor of rome. 306 00:17:38,091 --> 00:17:41,392 Augustus rapidly expands the empire, 307 00:17:41,494 --> 00:17:44,796 Conquering egypt, central europe, 308 00:17:44,898 --> 00:17:46,030 And northern Spain. 309 00:17:49,269 --> 00:17:51,202 But when hadrian becomes emperor, 310 00:17:51,304 --> 00:17:53,771 He halts the rapid expansion. 311 00:17:53,873 --> 00:17:57,175 He believes that the empire must protect its borders. 312 00:17:59,279 --> 00:18:01,813 He builds monumental defenses, like 313 00:18:01,915 --> 00:18:05,049 The famous hadrian's wall, across britain. 314 00:18:05,151 --> 00:18:08,252 But this conservative approach doesn't make him popular. 315 00:18:10,924 --> 00:18:15,693 Higgins: To win the romans over, hadrian devises a plan. 316 00:18:15,795 --> 00:18:19,831 Hadrian thought that he could raise his status 317 00:18:19,933 --> 00:18:21,332 With the roman people 318 00:18:21,434 --> 00:18:24,702 To portray himself as a second augustus. 319 00:18:24,804 --> 00:18:27,338 Narrator: So he decides to imprint on the facade 320 00:18:27,440 --> 00:18:29,240 Of the pantheon the name of 321 00:18:29,342 --> 00:18:32,210 Augustus's great friend, agrippa. 322 00:18:32,312 --> 00:18:36,180 Higgins: Hadrian tries to emulate augustus by rebuilding 323 00:18:36,282 --> 00:18:38,816 The pantheon and making an obvious reference 324 00:18:38,918 --> 00:18:40,051 To augustus. 325 00:18:40,153 --> 00:18:42,787 Narrator: Hadrian is the proud builder of the pantheon 326 00:18:42,889 --> 00:18:44,088 We see today, 327 00:18:44,190 --> 00:18:47,558 But he's not finished with his mission to emulate augustus. 328 00:18:49,496 --> 00:18:52,130 He makes one final monumental statement. 329 00:18:54,868 --> 00:18:56,801 In 123 a.D., 330 00:18:56,903 --> 00:18:59,670 15 years before his death, 331 00:18:59,772 --> 00:19:01,772 Hadrian builds his own tomb, 332 00:19:04,744 --> 00:19:07,044 Now called castel sant'angelo, 333 00:19:07,147 --> 00:19:10,214 His mausoleum dominates the west bank of rome's 334 00:19:10,316 --> 00:19:13,050 River tiber, so no one can miss it. 335 00:19:14,554 --> 00:19:18,523 Hadrian's mausoleum, his lavish villa, 336 00:19:18,625 --> 00:19:20,525 And the pantheon 337 00:19:20,627 --> 00:19:25,630 All reflect his vision for rome and his impressive empire. 338 00:19:25,732 --> 00:19:29,400 Hadrian sets out to outbuild his predecessors. 339 00:19:29,502 --> 00:19:32,737 His pantheon is bigger and better than the original. 340 00:19:34,908 --> 00:19:37,575 But how does hadrian ensure his pantheon 341 00:19:37,677 --> 00:19:39,810 Won't burn down like augustus's? 342 00:19:48,788 --> 00:19:49,820 Narrator: The pantheon. 343 00:19:51,591 --> 00:19:54,225 Built by the ingenious emperor hadrian on 344 00:19:54,327 --> 00:19:57,328 The foundations of augustus's original structure. 345 00:19:58,798 --> 00:20:01,599 But how does hadrian ensure that his pantheon 346 00:20:01,701 --> 00:20:03,634 Is indestructible 347 00:20:03,736 --> 00:20:05,102 And won't burn down 348 00:20:05,205 --> 00:20:06,470 Like his predecessor's? 349 00:20:09,275 --> 00:20:13,744 Hadrian's pantheon is still so perfectly preserved 350 00:20:13,846 --> 00:20:16,247 After almost 2,000 years, 351 00:20:16,349 --> 00:20:19,116 This area has been hit by earthquakes 352 00:20:19,219 --> 00:20:23,120 And struck by lightning and yet... 353 00:20:23,223 --> 00:20:25,656 It's still here, intact. 354 00:20:25,758 --> 00:20:28,893 This is a real miracle of engineering. 355 00:20:32,365 --> 00:20:34,565 Narrator: The outside of the pantheon's walls 356 00:20:34,634 --> 00:20:36,667 Is just bricks covered in plaster. 357 00:20:38,338 --> 00:20:40,238 Their real strength lies within, 358 00:20:41,641 --> 00:20:45,743 A rock-solid core of roman concrete to support the roof. 359 00:20:50,250 --> 00:20:53,050 But building decorative niches and recesses 360 00:20:53,152 --> 00:20:56,020 Into the walls creates weak spots, 361 00:20:56,122 --> 00:20:59,757 So roman engineers build brick arches into the pantheon 362 00:21:02,495 --> 00:21:05,763 To channel the weight of the roof into the thicker parts. 363 00:21:08,234 --> 00:21:11,235 Is this clever combination of brick and concrete 364 00:21:11,337 --> 00:21:13,904 The secret to the survival of the pantheon? 365 00:21:17,176 --> 00:21:19,143 Guido giordano is an expert 366 00:21:19,245 --> 00:21:21,779 In ancient roman building materials. 367 00:21:21,881 --> 00:21:24,982 He's on a mission to discover the secret to the concrete's 368 00:21:25,084 --> 00:21:26,851 Incredible strength. 369 00:21:26,953 --> 00:21:30,721 The mortar is made of this white-ish base 370 00:21:30,823 --> 00:21:35,559 And lots of these floating elements, very dark in color, 371 00:21:35,662 --> 00:21:39,063 And it's this particular component that makes 372 00:21:39,132 --> 00:21:43,934 This concrete so stronger than any other concrete. 373 00:21:44,037 --> 00:21:45,936 Narrator: What is the secret component 374 00:21:46,039 --> 00:21:47,538 Of this special concrete? 375 00:21:49,542 --> 00:21:53,344 Guido investigates the rocks that surround rome for clues. 376 00:21:54,847 --> 00:21:57,415 In the grounds of tor marancia park 377 00:21:57,517 --> 00:22:00,651 Guido finds a distinctive rock formation, 378 00:22:00,753 --> 00:22:04,388 The result of ancient volcanic eruptions. 379 00:22:04,490 --> 00:22:09,260 These volcanic explosive eruptions were 10 times 380 00:22:09,362 --> 00:22:12,797 Larger than the one that buried pompeii. 381 00:22:12,899 --> 00:22:14,832 Narrator: Can rocks like this unlock 382 00:22:14,934 --> 00:22:16,901 The secret of roman concrete? 383 00:22:20,873 --> 00:22:23,274 Guido finds a mysterious tunnel carved 384 00:22:23,376 --> 00:22:25,376 Into the volcanic rock. 385 00:22:25,478 --> 00:22:28,746 He instantly recognizes this structure. 386 00:22:30,583 --> 00:22:33,150 This tunnel is part of a very 387 00:22:33,252 --> 00:22:37,555 Extensive network that runs for kilometers underneath rome, 388 00:22:37,657 --> 00:22:40,224 Exploiting the underground. 389 00:22:40,326 --> 00:22:42,660 Narrator: It's inside tunnels like these that 390 00:22:42,762 --> 00:22:46,163 The romans discover the secret ingredient for their concrete. 391 00:22:48,334 --> 00:22:51,902 Giordano: This tunnel is an ancient roman quarry. 392 00:22:52,004 --> 00:22:56,006 This is where the romans excavated the volcanic 393 00:22:56,109 --> 00:23:01,312 Material for the concrete used to build the pantheon. 394 00:23:01,414 --> 00:23:04,582 Narrator: The secret ingredient of the roman concrete is 395 00:23:04,684 --> 00:23:06,917 Volcanic ash. 396 00:23:07,019 --> 00:23:10,955 This is loose, so very easy to be excavated, 397 00:23:11,057 --> 00:23:16,627 But also hard enough to hold a tunnel that is made of a wide 398 00:23:16,729 --> 00:23:19,397 Variety of particle sizes that 399 00:23:19,499 --> 00:23:26,470 Go from very fine ash to much larger volcanic [indistinct], 400 00:23:26,572 --> 00:23:29,073 And it is this variety of particle 401 00:23:29,175 --> 00:23:33,244 Sizes that provides a very strong interlocking. 402 00:23:34,380 --> 00:23:38,282 Narrator: This material is a game-changer for the romans. 403 00:23:38,384 --> 00:23:40,851 They learn to use volcanic ash instead 404 00:23:40,953 --> 00:23:43,721 Of traditional quartz sand to make their mortar. 405 00:23:45,992 --> 00:23:48,592 Guido recreates the roman concrete mix 406 00:23:48,694 --> 00:23:50,094 To test its properties. 407 00:23:53,266 --> 00:23:55,433 He starts with the volcanic ash. 408 00:23:57,737 --> 00:24:01,472 Then he mixes it with lime and water. 409 00:24:04,010 --> 00:24:07,178 So this is roman concrete, this is 410 00:24:07,280 --> 00:24:09,947 What was used to build the pantheon. 411 00:24:10,049 --> 00:24:13,250 You can see how easy it is to work it. 412 00:24:13,352 --> 00:24:16,487 It's very wet, and it doesn't hold anything. 413 00:24:16,589 --> 00:24:21,392 But over time, the volcanic particles inside 414 00:24:21,494 --> 00:24:24,929 Make a very special 415 00:24:25,031 --> 00:24:30,301 Kind of minerals that are not found in the classic, 416 00:24:30,403 --> 00:24:32,136 Ordinary mortar. 417 00:24:32,238 --> 00:24:34,472 Narrator: Now, to compare the mortar 418 00:24:34,574 --> 00:24:36,774 Made with volcanic ash, 419 00:24:36,876 --> 00:24:41,779 He repeats the process, mixing lime with the traditional sand. 420 00:24:41,881 --> 00:24:43,781 This mimics the concrete used 421 00:24:43,883 --> 00:24:45,816 In the buildings before the pantheon. 422 00:24:48,054 --> 00:24:50,955 We put the mortar on top, 423 00:24:51,057 --> 00:24:52,890 And then we put another stone... 424 00:24:57,463 --> 00:24:58,462 And wait. 425 00:25:00,066 --> 00:25:02,433 Narrator: Two hours later, the two different mixtures 426 00:25:02,535 --> 00:25:03,534 Have solidified 427 00:25:03,636 --> 00:25:05,836 And are ready to be put to the test. 428 00:25:07,306 --> 00:25:09,807 We already see a strong difference between these two. 429 00:25:09,909 --> 00:25:14,712 Here, the mortar is still very wet and ductile, 430 00:25:14,814 --> 00:25:16,180 Whereas 431 00:25:16,282 --> 00:25:19,850 In this one, you can see that it has already hardened. 432 00:25:19,952 --> 00:25:23,087 This is the one made with the volcanic ash. 433 00:25:23,189 --> 00:25:27,491 Narrator: The volcanic ash concrete is the clear winner. 434 00:25:27,593 --> 00:25:29,960 This material triggers a revolution in 435 00:25:30,062 --> 00:25:31,996 Roman construction. 436 00:25:32,098 --> 00:25:35,266 These will become the strongest link between 437 00:25:35,368 --> 00:25:37,167 These two pieces of rocks 438 00:25:37,270 --> 00:25:41,238 And the strongest mortar ever invented. 439 00:25:41,340 --> 00:25:45,576 Narrator: This new concrete has one last crucial benefit. 440 00:25:45,678 --> 00:25:48,879 Giordano: Roman concrete is so strong, it resists 441 00:25:48,981 --> 00:25:52,283 Even to high temperatures in case of fires. 442 00:25:54,453 --> 00:25:57,021 Narrator: This material is the reason this city's 443 00:25:57,123 --> 00:26:00,357 Most magnificent buildings have survived for millennia. 444 00:26:03,829 --> 00:26:06,797 Hadrian's engineers create an indestructible 445 00:26:06,899 --> 00:26:10,668 Pantheon that ensures he's remembered for eternity. 446 00:26:13,639 --> 00:26:17,274 But how do they build the seemingly impossible roof, 447 00:26:17,376 --> 00:26:18,742 The iconic dome? 448 00:26:28,387 --> 00:26:30,888 Narrator: Right in the heart of rome, 449 00:26:30,990 --> 00:26:35,392 The pantheon has the largest dome of its kind in the world. 450 00:26:35,494 --> 00:26:39,296 This hemispherical dome is the largest ever built 451 00:26:39,398 --> 00:26:41,031 Until reinforced concrete 452 00:26:41,133 --> 00:26:43,734 Is invented at the beginning of the 20th century. 453 00:26:46,472 --> 00:26:49,573 Towering 100 feet above the streets of rome, 454 00:26:49,675 --> 00:26:54,044 It stretches 142 feet across the pantheon. 455 00:26:54,146 --> 00:26:57,114 The walls at the base are 20 feet thick 456 00:26:57,216 --> 00:27:00,117 And taper to just 5 feet at the apex, 457 00:27:00,219 --> 00:27:03,420 And the concrete inside them is cleverly adapted. 458 00:27:03,522 --> 00:27:05,255 At the bottom, 459 00:27:05,358 --> 00:27:09,159 It contains crushed bricks to make it strong, 460 00:27:09,261 --> 00:27:10,127 And at the top, 461 00:27:10,229 --> 00:27:12,796 It contains fragments of pumice stone 462 00:27:12,898 --> 00:27:14,531 To make it light. 463 00:27:14,634 --> 00:27:17,234 On the inside, cut-out recesses 464 00:27:17,336 --> 00:27:20,004 Trim down the weight even more. 465 00:27:20,106 --> 00:27:21,972 But how do ancient roman 466 00:27:22,074 --> 00:27:24,875 Engineers actually build this colossal dome 467 00:27:24,977 --> 00:27:27,611 100 feet off the ground? 468 00:27:31,484 --> 00:27:34,885 Tullia iori is an expert in roman construction. 469 00:27:43,796 --> 00:27:46,730 Narrator: The enigma of the dome's construction inspires 470 00:27:46,832 --> 00:27:49,066 The roman people to devise their own theory. 471 00:27:51,370 --> 00:27:54,772 Legend says that to build the dome, 472 00:27:54,874 --> 00:27:57,941 Hadrian creates a huge mound of earth 473 00:27:58,044 --> 00:28:00,811 And hides gold coins inside. 474 00:28:04,717 --> 00:28:08,318 He uses the mound of earth as an enormous mold, 475 00:28:08,421 --> 00:28:10,988 Casting the pantheon's dome on top. 476 00:28:14,827 --> 00:28:16,994 Then he invites the citizens of rome 477 00:28:17,096 --> 00:28:20,097 To remove the earth inside the pantheon 478 00:28:20,199 --> 00:28:22,599 And keep all the coins they find. 479 00:28:31,711 --> 00:28:33,310 Narrator: Tullia believes that instead, 480 00:28:33,412 --> 00:28:36,113 The romans invent a new construction technique 481 00:28:36,215 --> 00:28:37,748 To build the dome. 482 00:28:38,784 --> 00:28:41,585 Tullia uses cutting-edge 3-d printing 483 00:28:41,687 --> 00:28:45,389 To investigate the dome's mysterious construction. 484 00:28:45,491 --> 00:28:48,392 She recreates a miniature version of the structure. 485 00:29:03,676 --> 00:29:06,210 Narrator: Until the invention of reinforced concrete, 486 00:29:06,312 --> 00:29:09,113 Most domes are assembled on the ground and lifted 487 00:29:09,215 --> 00:29:10,614 Into place. 488 00:29:10,716 --> 00:29:13,450 But this colossal dome is constructed 489 00:29:13,552 --> 00:29:15,919 Exactly where we see it today. 490 00:29:16,021 --> 00:29:19,723 How did the romans manage this seemingly impossible feat? 491 00:29:19,825 --> 00:29:22,059 Tullia thinks they have two options. 492 00:29:26,599 --> 00:29:28,832 They could build an internal scaffolding from 493 00:29:28,934 --> 00:29:31,902 The ground up to support the dome from beneath. 494 00:29:33,706 --> 00:29:36,840 Or they could build one ring after another 495 00:29:36,942 --> 00:29:40,611 And hope that each ring will support the next one. 496 00:29:44,383 --> 00:29:47,751 But even when complete, the risk isn't over. 497 00:29:47,853 --> 00:29:51,054 The dome weighs a mighty 5,000 tons 498 00:29:51,157 --> 00:29:53,524 And could collapse under its own weight. 499 00:29:57,596 --> 00:30:02,232 Tullia uses a clay model of the dome to investigate the risk. 500 00:30:02,334 --> 00:30:04,034 She pushes down on the model 501 00:30:04,136 --> 00:30:06,203 To simulate the weight of the concrete. 502 00:30:13,245 --> 00:30:14,511 Narrator: The pressure at the top 503 00:30:14,613 --> 00:30:17,247 Creates tension at the bottom 504 00:30:17,349 --> 00:30:20,484 That eventually cracks the lower edge. 505 00:30:22,254 --> 00:30:23,954 How did the romans ensure 506 00:30:24,056 --> 00:30:26,557 The dome doesn't collapse under its own weight? 507 00:30:27,993 --> 00:30:29,693 The key to the dome's survival 508 00:30:29,795 --> 00:30:33,130 Lies in an ingenious engineering trick. 509 00:30:33,232 --> 00:30:35,532 To prevent the lower edge from cracking, 510 00:30:35,634 --> 00:30:38,502 The romans secretly bury the bottom half of the dome 511 00:30:38,604 --> 00:30:39,970 Inside the rotunda. 512 00:30:41,307 --> 00:30:44,041 This way, the pressure is contained by the walls 513 00:30:44,143 --> 00:30:45,943 And external step rings, 514 00:30:46,011 --> 00:30:48,445 Ensuring the full stability of the structure. 515 00:30:57,523 --> 00:30:59,890 Narrator: The romans use these techniques to create 516 00:30:59,992 --> 00:31:02,459 A structure made to last for millennia. 517 00:31:16,976 --> 00:31:18,609 Narrator: By building the pantheon, 518 00:31:18,711 --> 00:31:22,646 Emperor hadrian changes the landscape of rome forever, 519 00:31:22,748 --> 00:31:24,815 And he creates one of the city's most 520 00:31:24,917 --> 00:31:26,950 Iconic buildings. 521 00:31:27,052 --> 00:31:28,886 But why do hadrian's engineers 522 00:31:28,988 --> 00:31:31,054 Leave a gaping hole at the pinnacle? 523 00:31:32,558 --> 00:31:33,957 What is its purpose? 524 00:31:42,334 --> 00:31:45,135 The pantheon is an engineering marvel. 525 00:31:45,237 --> 00:31:47,237 The unreinforced concrete dome 526 00:31:47,339 --> 00:31:49,539 At its top is the largest in history. 527 00:31:52,711 --> 00:31:54,177 At the pinnacle of the dome 528 00:31:54,280 --> 00:31:57,347 Is an unusual feature called the oculus. 529 00:31:57,449 --> 00:32:00,751 It's a 30-foot-wide hole that opens the pantheon to 530 00:32:00,853 --> 00:32:03,654 The heavens but also the elements. 531 00:32:03,756 --> 00:32:05,489 [ thunder crashes ] 532 00:32:05,591 --> 00:32:06,957 To deal with rain, 533 00:32:07,092 --> 00:32:10,427 The marble floor beneath gently curves like a bowl. 534 00:32:12,798 --> 00:32:15,999 It collects water and drains it 535 00:32:16,101 --> 00:32:19,403 Through 22 cleverly concealed drainage holes. 536 00:32:21,173 --> 00:32:22,572 When the sun shines, 537 00:32:22,675 --> 00:32:25,842 The oculus creates a beam of heavenly light that moves 538 00:32:25,945 --> 00:32:28,345 Through the pantheon. 539 00:32:28,447 --> 00:32:30,580 Where does emperor hadrian get 540 00:32:30,683 --> 00:32:33,183 The inspiration for this bold feature? 541 00:32:41,093 --> 00:32:44,261 Narrator: Archaeologist paolo carafa 542 00:32:44,363 --> 00:32:46,530 Examines another oculus in the ruins 543 00:32:46,632 --> 00:32:50,133 Of hadrian's famous villa to investigate this mystery. 544 00:32:52,071 --> 00:32:54,838 This miniature oculus, just 3 feet wide, 545 00:32:54,940 --> 00:32:57,040 Has a surprising purpose. 546 00:32:57,142 --> 00:32:59,609 Carafa: These are the great bath. 547 00:32:59,712 --> 00:33:04,014 This was the hottest room in the bath, like a steaming room, 548 00:33:04,116 --> 00:33:08,518 And it was covered by a dome with an oculus in it 549 00:33:08,620 --> 00:33:11,088 Exactly like the dome of the pantheon. 550 00:33:11,190 --> 00:33:13,790 Narrator: Today, half of this dome is missing, 551 00:33:13,892 --> 00:33:17,260 But paolo's reconstruction leads him to believe the oculus 552 00:33:17,363 --> 00:33:19,296 Plays a critical functional role 553 00:33:19,398 --> 00:33:20,897 In this structure. 554 00:33:21,000 --> 00:33:24,334 We can imagine people sitting on the benches all around this 555 00:33:24,436 --> 00:33:28,839 Wall with the steam flowing out of the hole in the dome. 556 00:33:28,941 --> 00:33:31,808 Narrator: Here, the function of the oculus is to let 557 00:33:31,910 --> 00:33:35,078 The steam from the baths out through the hole in the ceiling. 558 00:33:37,249 --> 00:33:40,417 The oculus is a key feature of roman baths for nearly 559 00:33:40,519 --> 00:33:41,718 A century before 560 00:33:41,820 --> 00:33:45,155 Hadrian creates his in his villa. 561 00:33:45,257 --> 00:33:49,126 The temple of mercury bathing hall in the nearby spa town 562 00:33:49,228 --> 00:33:50,927 Of baiae, has one of 563 00:33:51,030 --> 00:33:52,796 The largest oculi of its time. 564 00:33:54,867 --> 00:33:58,068 But in all roman baths, the dome and oculus 565 00:33:58,170 --> 00:34:01,905 Are always part of a larger complex of bathing pools. 566 00:34:03,409 --> 00:34:06,676 The buildings never stand alone, like the pantheon, 567 00:34:06,779 --> 00:34:09,513 And no oculus has ever spanned so wide. 568 00:34:10,883 --> 00:34:13,784 The pantheon's supersized oculus is twice as 569 00:34:13,886 --> 00:34:15,886 Wide as that in the temple of mercury. 570 00:34:17,189 --> 00:34:18,989 So what is its purpose? 571 00:34:20,392 --> 00:34:23,326 Carafa: In the pantheon, the oculus is a void space 572 00:34:23,429 --> 00:34:26,029 Created to sustain the whole dome. 573 00:34:27,800 --> 00:34:30,300 Narrator: Hadrian's engineers use their oculus 574 00:34:30,402 --> 00:34:32,903 To reduce the weight of the dome. 575 00:34:33,005 --> 00:34:34,938 This makes the largest dome in 576 00:34:35,040 --> 00:34:38,275 The world at that time a reality. 577 00:34:38,377 --> 00:34:41,044 Then they use the effect the oculus creates 578 00:34:41,146 --> 00:34:44,281 To give the pantheon an ethereal, heavenly aura. 579 00:34:45,751 --> 00:34:47,884 But hadrian goes one step further. 580 00:34:47,986 --> 00:34:51,721 His engineers expertly design the orientation of 581 00:34:51,824 --> 00:34:55,058 The oculus and the door to align with the sun 582 00:34:55,160 --> 00:34:58,695 Each year on April 21st, rome's birthday, 583 00:35:00,065 --> 00:35:01,932 When he enters the pantheon, 584 00:35:02,034 --> 00:35:05,402 Hadrian is bathed in awe-inspiring light. 585 00:35:05,504 --> 00:35:08,405 It makes him appear almost divine. 586 00:35:08,507 --> 00:35:11,041 The spectacle amazes the people inside. 587 00:35:12,878 --> 00:35:14,578 No other building in the whole of 588 00:35:14,680 --> 00:35:17,614 Ancient rome has ever created the same effect. 589 00:35:18,851 --> 00:35:23,286 How does hadrian formulate such a sophisticated design? 590 00:35:23,388 --> 00:35:26,089 Carafa: Hadrian traveled a lot. 591 00:35:26,191 --> 00:35:28,892 He travels all through the empire, 592 00:35:28,994 --> 00:35:33,730 And he claimed he was the only emperor to have seen every 593 00:35:33,832 --> 00:35:36,266 Place in his empire. 594 00:35:36,368 --> 00:35:39,603 Narrator: Do hadrian's travels across his empire also 595 00:35:39,705 --> 00:35:41,104 Inspire the pantheon? 596 00:35:45,244 --> 00:35:46,309 In his youth, 597 00:35:46,411 --> 00:35:49,813 Hadrian is nicknamed graeculus, meaning greekling, 598 00:35:49,915 --> 00:35:53,650 Because he likes to immerse himself in greek studies. 599 00:35:53,752 --> 00:35:57,587 As emperor, he frequently visits greece. 600 00:35:57,689 --> 00:36:01,224 He admires the culture and architecture 601 00:36:01,326 --> 00:36:04,361 And sponsors the construction of grand temples there. 602 00:36:08,033 --> 00:36:11,535 In return, the athenians build him a grand arch, 603 00:36:11,637 --> 00:36:15,105 Naming him as a co-founder of their city. 604 00:36:17,276 --> 00:36:20,243 Back in rome, he builds a lecture hall called 605 00:36:20,345 --> 00:36:23,513 The athenaeum to promote the greek way of thinking 606 00:36:23,615 --> 00:36:24,548 Among romans. 607 00:36:24,650 --> 00:36:30,086 ♪♪ 608 00:36:30,189 --> 00:36:35,125 Hadrian wants to make rome in some way the inheritor of 609 00:36:35,227 --> 00:36:37,093 The culture of athens, 610 00:36:37,196 --> 00:36:39,696 To leave it as his legacy. 611 00:36:39,798 --> 00:36:42,232 Narrator: Hadrian's greek legacy is secretly 612 00:36:42,334 --> 00:36:44,568 Embedded into the design of the pantheon. 613 00:36:46,538 --> 00:36:49,072 He uses scientific principles developed by 614 00:36:49,174 --> 00:36:51,841 The greeks to design the pantheon with 615 00:36:51,944 --> 00:36:53,109 Perfect symmetry. 616 00:36:54,646 --> 00:36:59,516 This faultless design gives it a sense of supreme harmony. 617 00:36:59,618 --> 00:37:03,153 Hadrian creates a building filled with greek features, 618 00:37:03,255 --> 00:37:06,022 A record-breaking oculus, and made of 619 00:37:06,124 --> 00:37:08,625 Indestructible materials. 620 00:37:08,727 --> 00:37:11,895 But how is the pantheon used when hadrian no longer 621 00:37:11,997 --> 00:37:12,996 Rules rome? 622 00:37:21,506 --> 00:37:23,473 Narrator: The powerful emperor hadrian 623 00:37:23,575 --> 00:37:26,142 Creates the pantheon to fulfill his vision 624 00:37:26,245 --> 00:37:30,814 Of a world ruled by greek harmony and beauty. 625 00:37:30,916 --> 00:37:32,549 But what happens to the pantheon 626 00:37:32,651 --> 00:37:35,685 After hadrian's death in 138 a.D.? 627 00:37:37,923 --> 00:37:39,789 The magnificent building is used as 628 00:37:39,891 --> 00:37:42,492 An audience hall for more than four centuries, 629 00:37:43,895 --> 00:37:45,829 But in 608 a.D., 630 00:37:45,931 --> 00:37:48,198 After the advance of christianity, 631 00:37:48,300 --> 00:37:51,835 Emperor phocas transforms the pantheon into a church. 632 00:38:06,551 --> 00:38:08,218 Narrator: For 14 centuries, 633 00:38:08,320 --> 00:38:12,222 To this day, the pantheon remains a catholic church. 634 00:38:12,324 --> 00:38:13,790 Throughout this time, it's been 635 00:38:13,892 --> 00:38:16,059 A constant source of inspiration. 636 00:38:18,130 --> 00:38:22,232 Renaissance engineer filippo brunelleschi spends 10 years in 637 00:38:22,334 --> 00:38:25,835 Rome, studying the pantheon to unlock its secrets. 638 00:38:27,105 --> 00:38:29,306 When he returns to florence, 639 00:38:29,408 --> 00:38:33,343 He builds the dome of santa maria del fiore cathedral. 640 00:38:33,445 --> 00:38:37,380 The dome has a diameter of 147 feet. 641 00:38:37,482 --> 00:38:41,518 Its dimensions exceed the pantheon's immense clear span. 642 00:38:42,988 --> 00:38:46,423 100 years later, michelangelo draws inspiration 643 00:38:46,525 --> 00:38:47,724 From the pantheon 644 00:38:47,826 --> 00:38:51,227 For the iconic brick dome of st. Peter's basilica in rome. 645 00:38:52,698 --> 00:38:54,097 But the influence of 646 00:38:54,199 --> 00:38:57,067 The pantheon travels much further than Italy. 647 00:38:59,271 --> 00:39:04,140 The rotunda at the university of virginia is built in 1822. 648 00:39:04,242 --> 00:39:07,243 It's designed by u.S. President thomas jefferson, 649 00:39:07,346 --> 00:39:09,713 Who is inspired by the pantheon. 650 00:39:09,815 --> 00:39:11,948 It is the focal point of the school. 651 00:39:13,552 --> 00:39:17,220 Jefferson is an architecture enthusiast, just like hadrian. 652 00:39:18,423 --> 00:39:22,192 The jefferson memorial, built in the 1940s, 653 00:39:22,294 --> 00:39:24,928 Is a tribute to one of the founding fathers, 654 00:39:25,030 --> 00:39:27,597 As well as to his architectural designs. 655 00:39:30,102 --> 00:39:33,069 And right in the heart of washington, d.C., 656 00:39:33,171 --> 00:39:37,006 The pantheon is forever remembered in the rotunda of 657 00:39:37,109 --> 00:39:38,775 The u.S. Capitol, 658 00:39:38,877 --> 00:39:41,177 The ultimate symbol of democratic government 659 00:39:41,279 --> 00:39:42,579 In the world. 660 00:39:44,583 --> 00:39:46,583 Higgins: The pantheon symbolizes 661 00:39:46,685 --> 00:39:49,018 A type of architecture that has been used 662 00:39:49,121 --> 00:39:51,688 Throughout the world to indicate 663 00:39:51,790 --> 00:39:55,225 Public buildings that carry great weight 664 00:39:55,327 --> 00:39:58,561 And that are hugely important for the nation. 665 00:39:58,663 --> 00:40:00,964 Narrator: Today, the pantheon remains one of 666 00:40:01,066 --> 00:40:02,999 The most famous symbols of rome. 667 00:40:04,770 --> 00:40:06,970 Hadrian's legacy is long-lasting. 668 00:40:08,373 --> 00:40:12,142 The pantheon continues to awe all that enter its doors. 669 00:40:13,945 --> 00:40:17,680 But once a year, his oculus finds a new purpose. 670 00:40:32,164 --> 00:40:34,764 Narrator: From religious to public buildings, 671 00:40:34,866 --> 00:40:37,533 This mighty structure has been a constant symbol 672 00:40:37,602 --> 00:40:39,536 Of innovation. 673 00:40:39,638 --> 00:40:43,306 Emperor hadrian uses his villa to trial ingenious 674 00:40:43,408 --> 00:40:45,008 Engineering feats 675 00:40:45,110 --> 00:40:48,778 And draws on buildings from across his empire to create 676 00:40:48,880 --> 00:40:50,713 The ultimate monument, 677 00:40:50,816 --> 00:40:53,016 Built to last forever. 678 00:40:53,118 --> 00:40:55,485 Higgins: This building is the best preserved 679 00:40:55,587 --> 00:41:00,123 Roman building that we have, and it shows us the genius, 680 00:41:00,225 --> 00:41:03,226 The spirit, of roman architecture. 681 00:41:06,398 --> 00:41:08,064 Narrator: The pantheon is one of rome's 682 00:41:08,166 --> 00:41:10,733 Most astonishing achievements, 683 00:41:10,836 --> 00:41:15,071 An engineering marvel with a record-breaking roof, 684 00:41:15,173 --> 00:41:17,207 Roman concrete at its heart, 685 00:41:19,110 --> 00:41:22,712 And clues to its past hiding beneath its foundations. 686 00:41:24,449 --> 00:41:27,217 The iconic pantheon still stands strong 687 00:41:27,319 --> 00:41:28,585 At the heart of rome, 688 00:41:28,687 --> 00:41:33,156 Connecting the past and present of this eternal city. 689 00:41:33,258 --> 00:41:40,964 ♪♪ 690 00:41:41,066 --> 00:41:50,139 ♪♪ 691 00:41:50,242 --> 00:41:58,381 ♪♪ 692 00:41:58,483 --> 00:42:02,685 ♪♪ 693 00:42:02,685 --> 00:42:04,685 1moovlmvhd 54704

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