Original subtitles

Beneath Naples, Italy,

the occupant of a centuries-old tomb is called into question.

Researchers suggested that one of the graves

in the monument is not what it seems.

In the cliffside caves of the Judean Desert,

an archaeologist makes a grim discovery.

They uncovered Roman cult objects,

Hebrew and Aramaic manuscripts,

and the skeletal remains of at least 17 individuals.

But who carried these objects into the cliffs and why?

A massive limestone cave structure is discovered

below the streets of Malta.

What we now call the Hal Saflieni Hypogeum

revealed itself as a sprawling subterranean labyrinth.

But who carved this intricate

subterranean labyrinth? And why?

Below the busy streets of the world's cities

exists a hidden realm of wonder.

Sprawling ancient complexes,

mysterious tombs,

top-secret military bases,

strange structures,

and lost artifacts

buried beneath our feet and long forgotten...

until now.

Underground marvels are exposed to reveal what lies

Hidden Beneath the Cities.

23 miles northwest of Italy's iconic Amalfi Coast,

nestled in the country's Campania region,

is the bustling city of Naples.

Naples is a quintessential Italian city,

but interestingly it was founded by Greek settlers in 600 BCE.

After centuries of rule by a shifting array of leaders,

it joined the newly unified Kingdom of Italy in 1861.

The city has incredible historic monuments,

centuries-old palaces,

and because of its Catholic roots, over 450 churches.

It's also a city on top of a city.

Deep below its cobblestone streets

is an abandoned metropolis called Napoli Sotterranea.

An awe-inspiring underworld

made up of ancient Greek and Roman ruins.

One of the most fascinating historical sites

in Naples is situated at the center of town,

the Monumental Complex of Santa Maria la Nova.

It was founded in 1279 as a Franciscan citadel,

but it eventually became a cultural hub for the city,

collecting artistic works from the Renaissance

and Baroque periods.

Today, it boasts a museum, a breathtaking church,

and cloisters that are lined

with the tombs and monuments of nobles.

In 2014, a startling claim from outside the walls

of Santa Maria la Nova shakes the spiritual foundation

of this historic landmark.

Researchers suggested that one of the graves

in the monument Saint Giacomo della Marca Cloister

is not what it seems.

The marble tomb was sculpted

by a renowned Italian artist named Jacopo della Pila

and has all the hallmarks

of an elaborate Renaissance-era design.

There's a large decorative arch adorned with rosettes

and an insignia depicting the Madonna and Child.

And a series of remarkable carvings adorn the tomb,

including a dragon and a pair of opposing sphinxes.

For hundreds of years, the tomb was always assumed

to be that of Matteo Ferrillo,

a powerful nobleman in 15th century Naples.

But the scholar contends that the tomb is merely a decoy

designed to conceal the secret burial site

of its true occupant,

a 15th century prince named Vlad III Draculea,

a man who would become the inspiration

for none other than Count Dracula.

It's an astounding proposition.

Prince Vlad dedicated most of his adult life

to fighting back the expansion of the Ottoman Empire,

and he became known for his cruel and brutal tactics

on the battlefield.

He was particularly famous for executing his victims

by impalement, earning him the moniker Tepes,

which means "the Impaler."

Reportedly, during a winter battle

against the Ottomans in 1476, Vlad was decapitated.

His head was preserved in honey

and sent to the sultan in Constantinople.

But it's never been clear

where his headless corpse was eventually buried.

In the 15th century, the Kingdom of Naples

was a military powerhouse

and a known ally to those fighting the Ottoman Empire.

So it's plausible that after his untimely death,

Prince Vlad's followers may have fled Romania

and brought his corpse to Naples for burial.

It's also been suggested that the prince

wasn't killed in battle.

Instead, he was captured by the Ottomans

and ransomed by his daughter,

who had previously escaped to the Court of Naples.

It's alleged that Vlad was then brought to the city

to live out the rest of his days,

and upon his death, he was secretly entombed

at the monumental complex

to protect the body from his enemies.

Researchers point to the sculptural details

carved into the sarcophagus as clues about its inhabitant.

The dragon carving is interpreted as a key symbol

linking the tomb to Vlad Draculea,

a reference to his last name, Son of the Dragon.

And like his father before him, Prince Vlad was a member

of an order of knights called the Order of the Dragon.

The image of the two sphinxes could also be

a coded message, representing the Egyptian city of Thebes,

which proponents claim to be phonetically similar to tepes,

the Romanian word for "impaler."

But these interpretations of the carvings

are fairly tenuous, to say the least.

We see sphinxes and dragons as common motifs in many pieces

from the Neapolitan Renaissance.

But there's another clue carved into the marble,

that confounds even the harshest skeptics

of the Naples burial.

Hidden beneath the tomb there's a strange inscription

that doesn't seem to be written in any known language.

When the characters of the epigraph were analyzed,

it was estimated that it was likely written

in the 16th century, after the tomb was installed.

So why would someone chisel these letters

into the back of a tomb 100 years later?

The bizarre writing is fuel for proponents

of the Naples burial theory,

but critics challenge the very premise of Vlad's arrival here.

We know that Prince Vlad had three sons,

but there's no certainty that he had a daughter.

It makes the entire idea that Vlad somehow survived

the battle with the Ottomans

before being whisked away to Naples seem highly suspect.

But if we can assume he was killed in battle,

what happened to his body?

For centuries, local folklore in Romania

told an altogether different story

of Prince Vlad's final days.

It was said that after he was killed on the battlefield

and beheaded by the Ottomans,

monks recovered his body to give it a proper Christian burial.

The corpse of Vlad reportedly was transported

to the Snagov Monastery, located on an island near Bucharest,

where he was buried in front of the church altar,

hidden away from anyone who may have wanted to defile the grave.

So could this be the final resting place

of Vlad the Impaler?

In 1933, archaeologists received permission

to excavate the unmarked grave.

Inside the tomb, they found a coffin

and a collection of bizarre artifacts,

including fragments of prehistoric pottery

and horse bones.

A second monastery in Romania may hold

a more credible claim to the body of the prince.

In 1461, Vlad founded his own monastery

in Comana, Romania.

It was located just south of Bucharest,

where the prince would meet his end

during that fateful winter battle.

After he was killed, it seems entirely possible

that the prince's followers would have transported him

to his own monastery.

And here's where it gets interesting.

Sometime in the 1970s, a group of archaeologists

supposedly excavated the monastery grounds

and discovered a tomb.

However, as enticing as it may be, there's no proof

that the tomb found at Comana was Vlad the Impaler.

The excavation was poorly documented,

so it's unknown if the remains were ever analyzed

or where they're even housed today.

Another problem with the Comana theory

is that the original church founded by Vlad was demolished

and then rebuilt in the 16th century.

Even if we can assume that Vlad was buried there,

it's highly unlikely the original tomb

would have survived the monastery's demolition.

Ultimately, the real occupant of the tomb

may be hidden in plain sight.

There's a clear inscription written in Latin

stating the name of the Neapolitan nobleman

it was commissioned for: Matteo Ferrillo.

Lying on top of the sarcophagus

is a stone effigy of Ferrillo himself.

Notably, the facial features of the effigy bear no resemblance

to the famous painting of Vlad Draculea,

which sits today in the Ambras Castle in Austria.

The dragon carved into the marble tomb

is actually the official crest of the Ferrillo family.

And a winged dragon was also a symbol associated

with the kings of Aragon, whom Ferrillo had served.

And there's another important feature to the tomb

that makes Vlad's Naples burial problematic.

The tomb itself is dated to 1499.

This flies in the face of the accepted timeline

around Vlad's death.

If he had died on the battlefield

in the winter of 1476,

why would his headless body have been transported to Naples

over 20 years later to be buried in the tomb

of the Ferrillo family?

In June of 2025,

an international team of researchers

from Italy, Estonia, and Romania make a startling claim

about the mysterious inscription.

They claim they've managed to decipher the text

on the back of the tomb.

Incredibly, they allege it's the epitaph of an individual

who is not Matteo Ferrillo, but that of Vlad the Impaler.

The full text of the epigraph has not been released,

nor has it been submitted to a third party for academic review.

So we have no idea what methodology they're using

to decipher the inscription or what it might say.

The decoded text could be a revelation,

a gross misinterpretation, or an elaborate hoax.

At this point, we just don't know.

Far from solving the mystery of Dracula's tomb,

the translated epigraph has instead created

more questions than answers.

For now, the story of Vlad the Impaler's final resting place

remains as mythic as the tale

of the fictional vampire he inspired.

About 20 miles south of Qumran,

near the modern border of Jordan,

the Nahal Hever stream winds through the Judean Desert.

The Judean Desert, located east of Jerusalem,

spans about 580 square miles,

stretching between the Judean Hills and the Dead Sea.

Its proximity to ancient urban and religious centers

like Bethlehem, Hebron, and Arad

made it a critical crossroads throughout history.

The caves scattered across the desert

have served as refuges since prehistoric times.

Their remote, rugged terrain offered natural concealment,

making them ideal shelters for rebels, religious sects,

and anyone fleeing conflict or persecution.

After the 1947 discovery of the Dead Sea Scrolls

at Qumran, these caves attracted intense interest

from both archaeologists and looters alike.

The region's extreme aridity helped preserve

organic materials exceptionally well,

making these caves rare repositories

of cultural and historical evidence.

In 1960, an Israeli archaeologist climbs

into a hidden cave carved into the cliffs of Nahal Hever

on the western bank of the Dead Sea,

bringing to light a trove

untouched for nearly 2,000 years.

After crawling nearly 450 feet

into the bat-infested cave, they uncovered Roman cult objects,

copper vessels, incense shovels, Hebrew and Aramaic manuscripts,

and the skeletal remains of at least 17 individuals.

Most of these artifacts date to a period of intense upheaval

and Roman suppression in the second century CE.

The so-called Cave of Letters

lies 300 feet below the Judean Desert plateau

and 650 feet above the valley floor.

Inside, the cave splits into three vaults,

each reachable only by squeezing through narrow, rocky gaps.

So far, nearly 1,800 feet of passages have been explored.

Interest in the cave began years earlier,

when Bedouins reported fragmentary finds

north of Masada.

But when excavators returned in 1961,

they found an even larger trove--

dozens of papyri, legal contracts,

and biblical manuscripts.

But they also found everyday items,

such as utensils, baskets, textiles, jewelry, clothing,

all of which offers us a glimpse of survival

on the desert's edge.

But the deeper purpose of this hidden cave

is still a total mystery.

We don't know who carried these objects into the cliffs.

We don't know why.

But the bigger question is, how did they hope to endure

in this totally unforgiving place?

And what do these traces reveal about how they balanced

resistance, faith, and everyday life?

The cave of letters may have served a purpose

deeply tied to writing, language,

and cultural identity.

Texts from the cave reveal at least four

distinct private archives, offering rare insight

into daily life, legal disputes, and social networks in Judea

during the first and second centuries CE.

So could the Cave of Letters have been used

to safeguard family memory and legal identity?

Among these archives, 35 separate papyrus scrolls

belonged to a woman named Babatha,

the daughter of a wealthy Jewish landowner.

Born around 104 CE in Mahoza, south of the Dead Sea,

she inherited her father's date orchards

and became an independent landowner.

In 106 CE, the region was annexed by Rome,

forcing locals to navigate new legal systems

and Roman provincial courts.

Babatha's archive included marriage contracts,

property deeds, court petitions, and loan records

show how she actively defended her rights

as a twice-widowed mother,

even confronting Roman-appointed

guardians in Petra.

Written in Greek, Nabataean, and Aramaic,

these documents reveal her wealth, her authority,

and underscore how crucial written records were

for protecting property and social standing

under Roman rule.

The team also uncovered Babatha's personal belongings.

Jewelry, expensive clothing, sandals, a mirror, cosmetics,

all of it carefully stashed in a rock crevice

and then covered with a stone.

Now, that suggests she intended to come back.

So even while fleeing,

she prioritized preserving her identity and rights.

And this reinforces the idea that the Cave of Letters

functioned as a sanctuary for safeguarding

vital personal and legal records.

10 miles to the north,

evidence at the Wadi Murabba'at caves

reveals a strikingly similar pattern.

In 1952, excavations at the site uncovered textiles,

baskets, ropes, and a substantial collection

of leather and papyrus fragments

written in Greek, Hebrew, and Aramaic.

Most date to the early second century CE,

including a Greek marriage contract from 124.

Further evidence that families carried

legal and personal records while fleeing Roman forces.

This pattern supports the idea that the Cave of Letters

was chosen as a secure location to protect important materials

during times of crisis.

The last document in Babatha's archive

dates to August 132 CE in Mahoza.

Soon after, she likely fled south as Roman forces advanced,

ultimately seeking shelter in the Cave of Letters.

Her carefully deposited archive provides

rare archaeological evidence of how Jewish families fought

to preserve their rights and identities

in the face of upheaval.

And it also raises the possibility

that the cave's role extended beyond just simple storage.

Other evidence inside the cave suggests

a sudden, organized occupation

tied to a critical moment of resistance and a tragic end.

Inside the cave, archeologists found

11 to 15 letters from Simon Bar Kokhba.

He's the leader of a fierce Jewish uprising

against Rome during Emperor Hadrian's reign.

So the question is, could this cache indicate

that the cave once functioned as a hidden command post

as Roman forces were closing in?

Seven of these letters were addressed

to his deputy commander, issuing orders for supplies and arrests.

These documents anchor the cave to the revolt's second phase,

around 132 to 135 CE,

when fighters shifted from open battle to guerrilla tactics.

By that time, the rebels had turned

to defensive strategies,

creating a network of hidden strongholds in caves

and remote hideouts throughout Judea to stall Roman advances.

This fierce resistance was driven by Emperor Hadrian's

severe measures, including the founding of Aelia Capitolina

on the ruins of Jerusalem,

with plans to build a temple to Jupiter

over the destroyed Jewish temple;

acts that pushed many to the breaking point.

By 2015, archaeologists had recorded about 350

of these hideouts across 140 villages.

The Cave of Letters fits within this strategy.

It's a concealed sanctuary

reached only when surface positions are no longer tenable.

Around 25 miles south of Jerusalem,

just west of the Dead Sea,

another cave offers a chilling glimpse into a community

pushed to the edge under siege.

The Cave of Horror,

accessible only by descending 200 feet on ropes,

was discovered in the 1950s and used as a hidden refuge

during the Bar Kokhba Revolt,

which was a Jewish rebellion against Roman rule in Judea.

Archaeologists have since uncovered 40 human skeletons,

including a child wrapped in cloth.

Roman encampments found directly above the cave suggest

that those inside were besieged, cut off from supplies,

and ultimately died of starvation.

Like the Cave of Horror, the Cave of Letters shows

a carefully planned attempt at survival.

But evidence inside challenges the idea

of a final military fortress.

The presence of women and children,

combined with extreme heat and a lack of water,

suggests it wasn't designed for prolonged defense.

The conditions of the remains supports this:

skulls were separated and gathered in baskets,

jaw bones are missing,

long bones are wrapped in mats.

These are all signs of crisis-driven makeshift burials.

And the absence of violent trauma

also indicates that these individuals

likely died from starvation, not combat.

While the letters from Bar Kokhba

point to an organized military presence,

the cave's proximity to En Gedi,

a communal settlement and key economic center

from which rebels fled during the revolt's final stages,

suggests that local fighters, possibly joined by families,

used it as an emergency refuge, not a fortified holdout.

Together, these clues point to a short-term shelter

during extreme danger, rather than a permanent military base.

This perspective also opens the possibility

that the cave's use began even earlier,

during an older and equally desperate chapter

in Jewish history.

Archaeologists uncovered about 80 new fragments

of the Dead Sea Scrolls in the Cave of Horror,

dating from the third century BCE to the first century CE.

These fragments, including sections

of The Book of the Twelve Minor Prophets written in Greek,

offer a glimpse into the religious mindset

of refugee communities.

Beyond family archives and rebel hideouts,

some interpreted evidence from the Cave of Letters

as holding secrets tied to the fall

of Jerusalem's holiest sanctuary.

During the original excavations,

archaeologists uncovered bronze objects,

including incense shovels,

originally believed to be Roman items,

but possibly plundered by Bar Kokhba's fighters

from En Gedi.

But decades later, another team

proposed a bold reinterpretation.

Could these objects actually date to the first century CE,

hidden after the destruction

of Jerusalem's second temple in 70 CE?

Excavations in 1999 and 2000 uncovered coins

from multiple periods, including a Nabataean coin from 106 CE,

a Trajan coin from around 113 CE,

a silver coin of Vespasian dated to 70 CE,

and a First Revolt coin from 68 CE.

Together, these finds suggest that the cave may have been

occupied even before the Bar Kokhba uprising,

perhaps during the earlier First Jewish Revolt.

About 100 miles north in Migdal

on the western shore of the Sea of Galilee,

another discovery may shed light on the movement

of sacred objects and practices beyond Jerusalem.

Archaeologists uncovered a delicately crafted

bronze incense shovel and jug

in a 2,000-year-old Jewish settlement.

Magdala was once a bustling port and later a military base

for Jewish rebels against Rome and held a large synagogue

dating to the early first century CE.

The shovel was from the Second Temple period

and was likely used to rake coals

during ritual incense offerings,

though it might have also served practical daily purposes.

The Magdala shovel closely resembles

the incense shovel found at the Cave of Letters,

and that parallel suggests that implements originally tied

to temple rituals in Jerusalem

were present across distant communities,

possibly carried by the people who lived there

seeking to protect their sacred practices and objects

from Roman pressure.

In the end, no definitive evidence confirms

that the Cave of Letters was occupied

during the first century CE.

And whether it served as a temporary refuge,

a secure archive, or a secret treasury for temple relics,

that's all still up for debate.

The cave's full story is yet to be unfolded.

The Cave of Letters holds a stratified record

of refuge, resistance,

and the effort to safeguard identity under Roman rule.

Each artifact unearthed not only expands our understanding,

but also deepens the questions

surrounding the cave's shifting roles across time.

Two miles south of Valletta,

perched on a low limestone ridge

above Malta's Grand Harbour, sits the modern town of Paola.

Paola lies at the center of Malta's urban sprawl,

just beyond the capital.

Built in the 17th century to ease overcrowding in Valletta,

it became a home for dock workers and laborers

tied to the booming harbor.

More than 9,000 people live here in less than one square mile.

Malta is a crossroads,

an island just 60 miles south of Sicily.

Its central position in the Mediterranean made it a hub

for trade and cultural exchange for millennia.

Malta's story begins long before recorded history.

By about 5200 BCE, Neolithic settlers had arrived

from Sicily, mainly fishermen,

hunters, and farmers who lived in caves.

But by 3600 BCE, they were constructing megalithic temples,

vast stone complexes that predate both Stonehenge

and the pyramids of Egypt.

In 1902, during the construction

of a housing subdivision on Hal Saflieni Street,

a stonemason falls through a roof

and stumbles into something strange.

There was a hollow chamber

beneath the soft limestone.

Initially, the discovery was suppressed

to avoid disrupting construction.

But in 1903, once most of the homes had already been built,

it was formally reported.

The Valletta Museum assigns a Jesuit priest

to lead the first official excavation.

What he uncovers is unlike anything Malta had seen.

What we now call the Hal Saflieni Hypogeum

revealed itself as a sprawling subterranean labyrinth.

The oldest chamber was likely a natural cave

that was gradually transformed into a complex

of over 30 rooms across three levels.

It descends to a depth of nearly 35 feet

and stretches across almost 5,400 square feet

beneath the modern city.

There are no straight lines,

just fluid organic curves, and all of it was carved by hand,

using nothing but stone, horn, and antler.

The complex is dated at over 6,000 years old,

making it one of the most extensive and best-preserved

Neolithic environments ever found.

But who carved this intricate subterranean labyrinth? And why?

Another archaeologist takes over the excavation

of the Hal Saflieni Hypogeum

and discovers something unexpected.

The chambers, especially those

on the lower level and near the entrance,

were packed with dense red earth,

around three feet deep in places.

Embedded in it were bones,

Neolithic pottery, tools, and beads.

They also found burial chambers in the upper level.

Given the density and placement of these remains,

it seems like it may have been used as a burial site.

It was first believed that the Hypogeum

may have functioned as a vast secondary ossuary.

Bodies would have been defleshed elsewhere

and only the bones brought here.

Some estimates suggest that based on the site's scale,

layout, and depth, it was estimated

that it could have held the remains

of up to 7,000 individuals accumulated over centuries.

When some of the skulls were re-examined in the 1980s,

surprising clues jumped out.

One skull had clear signs of sun exposure,

suggesting that it had been left to dry before burial.

That tells us that there may have been

a secondary burial practice.

Some of the skulls are removed for examination,

and the results are rather surprising.

They have an elongated cranial shape

known as dolichocephaly,

and later tests showed evidence of thalassemia intermedia,

a blood disorder that can lead to bone abnormalities.

In antiquity, physical traits like elongated skulls,

or even extra digits, were often interpreted

as signs of semi-divine status or ancestry.

And interestingly, similar cranial features appear

in depictions of New Kingdom pharaohs.

It raises the possibility

that this wasn't just a communal burial site,

but a sacred resting place for individuals

believed to hold special status.

But the burials here don't fit a ceremonial pattern.

One skeleton at Hal Saflieni was found twisted on its right side,

frozen in a contorted position consistent with cadaveric spasm.

That's the kind of muscular rigidity

that occurs in sudden, traumatic deaths, like drowning.

That stands in sharp contrast to ritual burials

at nearby sites like Bur-Meghez,

where individuals with similar elongated skulls

were carefully placed in a uniform left-facing pose.

And in one chamber, over 120 skeletons

were crammed into a space that could barely fit a dozen bodies.

The remains were so mixed up and disturbed

that artifacts were found inside skulls.

Whatever happened here, it wasn't a structured burial.

Just half a mile away, at Santa Lucija,

researchers discovered a site

with noticeable parallels to the Hypogeum.

They found a subterranean chamber

filled with red soil, disarticulated bones,

and a chaotic scattering of pottery and tools,

as if the contents had been dumped in there

from the surface.

Given the site's proximity to the Hypogeum,

could the same kind of event have unfolded there?

One theory points to the alluvial nature

of the deposit, suggesting a catastrophic flood

swept through the original entrance,

carrying centuries of artifacts, human remains,

and ochre-stained soil into the open chambers below.

Similar material found near the original entrance

supports this idea.

But as the chambers deepen, so does the complexity.

And some features seem designed not for the dead,

but for the living.

Red ochre spirals, checkerboards,

and honeycomb patterns cover the walls and ceilings--

Malta's only surviving prehistoric paintings.

Figurines of birds and animals,

some small enough to be worn as pendants,

appear carefully placed.

And at the heart of it all, the so-called Sleeping Lady,

which is a ceramic figure of a reclining woman,

was found in the main hall, which is the largest room.

There's also an interesting parallel at Tarxien.

Figures representing diseased body parts were found there.

They displayed exaggerated abdominal swelling,

hollowed iliac regions, and a kyphotic spine,

which could reflect health issues,

such as abdominal tumors.

It suggests that those temples may have served

a votive or healing function,

where people left offerings in the hope of divine intervention.

So maybe that's what was happening at the Hypogeum, too.

At the core of the Hypogeum,

one team discovers the so-called Holy of Holies,

a chamber that closely mirrors the design

of Malta's above-ground temples.

Just in front of it,

they found a set of carved floor holes, likely used

for pouring libations or securing ritual offerings.

These same features appear on other above-ground sites

in Malta, like Ggantija.

It suggests a shared ceremonial language

between the worlds above and below.

That continuity runs deeper.

Beveled cornices, pitted stone surfaces,

even trilithon-style doorways,

all echo what we see at other Maltese sites.

And a carved plate featuring horned bulls was found,

which mirrors the motifs found at Tarxien,

a nearby archaeological complex.

Near the entrance of one of the decorated rooms,

there's a carved hand, eight inches long,

with six fingers instead of five.

It's far larger than any normal human hand.

In many ancient cultures,

polydactyly was seen as a sign of divinity,

and it's been tied to cult ceremonies.

On the second level, archaeologists uncover

one of the most mysterious features

in the entire structure,

and the clues shift from the visual to the acoustic.

Inside the so-called Oracle Room,

there's a two-foot-wide hemispherical niche,

about the height of a man's mouth,

carved directly into the stone.

When someone speaks or hums at that exact spot,

the effect is astonishing.

Low tones are amplified 100-fold

and carry throughout the entire complex.

You could be in a completely different chamber

and still hear every word.

There's also a carved projection

behind the oracle niche

that functions almost like a sounding board.

A voice projected from that spot could create the illusion

of sound coming from all around

and with echoes lasting seven to eight seconds,

amplifying even a single phrase.

All this suggests the Hypogeum was designed

as a ritual performance space, long before places like Delphi.

Archaeologists notice that even the ceiling appears

to have been shaped like a waveguide,

carefully contoured to help direct and amplify sound.

Inside the Oracle Room, it was discovered

that when a male voice hits certain tones,

the entire chamber resonates.

Studies have shown that frequencies in this range

can alter brain activity,

much like we've found inside megalithic chambers in the UK.

It's likely the space was deliberately engineered

for chanting or incantation

to induce hypnotic, trance-like states of consciousness.

Recent 3D wave simulations suggest

those resonant peaks weren't accidental.

To produce them, the builders would have needed to calibrate

six to eight non-adjacent walls across multiple chambers,

each within only four to 10 inches of precision.

That level of geometric coordination

across separate spaces is no coincidence.

The hypogeum is one of the oldest known examples

of engineered resonance in human history.

Between 3600 and 2500 BCE,

Malta's prehistoric builders constructed

more than 30 megalithic temples,

an architectural legacy

unparalleled in Neolithic Europe.

What makes these temples remarkable

isn't just their age, it's their sophistication.

Each site is uniquely engineered,

but most follow a recognizable pattern.

A concave facade, a central passage,

and a series of semicircular chambers, or apses,

arranged symmetrically.

The scale is staggering.

Builders quarried, transported, and raised limestone blocks

weighing up to 20 tons to heights of nearly 20 feet.

This kind of construction demanded coordinated labor,

shared engineering knowledge,

and long-term planning across generations.

The Hal Saflieni Hypogeum takes that ambition

even further.

It's the only known subterranean labyrinth of its kind

in Neolithic Europe, from 4000 to 2500 BCE.

In many ways, it feels like an intentional attempt

to surpass everything above ground.

Artifacts dating to the 1700s,

such as a coin from the Knights of St. John

and a French cannonball,

hint that the Hypogeum may have been exposed,

or at least partially known,

long before its official rediscovery in the 20th century.

But if anyone understood what it was, we have no record of it.

Today, the Hal Saflieni Hypogeum stands

as a testament to the ingenuity and imagination

of a society at the dawn of agriculture.

But for all we've uncovered--

its artistry, acoustics, and architecture--

much of its meaning remains sealed in stone,

buried under the city.

On Kenya's southeastern coast

lies Kilifi County,

a region renowned for its dazzling beaches,

spectacular landscapes, and rich biodiversity.

Unlike a lot of northern Kenya,

which is quite dry, this part of the country is humid

and tropical with lush forests

that are home to a wide variety of plant species and wildlife.

It's an ecotourism hotspot.

The coastal areas near the Indian Ocean

have sweeping mangrove forests;

important breeding grounds for mollusks, crustaceans,

and many species of fish.

They also help protect the coastline

from growing sea levels and damaging storms,

and they play a vital part

in capturing atmospheric carbon dioxide.

Just under 10 miles inland are the Dzitsoni Uplands,

a series of limestone hills almost two miles wide,

situated in an ecotone,

which is a transitional area between two biomes.

In this case, the intersection of grassland savanna

and tropical forest.

The hills are pocked with natural rock shelters

and extensive cave complexes.

One of these complexes is known as Panga ya Saidi,

a multi-chambered cave system that extends over half a mile

with a cavernous main chamber

that reaches 1,100 square feet at its widest.

It's partially unroofed, and the limestone walls tower

almost 100 feet above the cave floor in some spots.

In 2010, a team of international researchers

arrives at Panga ya Saidi

to investigate the history of Indian Ocean trade

along East Africa's coast,

only to discover much more than they bargained for.

They quickly realized after the initial surveys

that the site may be far more scientifically important

than they'd initially thought.

And so began a decade-long series of excavations

that may upend long-held beliefs about human evolution in Africa.

They discovered 19 unique stratigraphic layers

showing evidence of human presence

going back about 78,000 years.

That is the longest uninterrupted

archaeological sequence in East Africa.

That stretches from the Middle Stone Age

all the way to about 500 years ago.

One school of thought was that modern human behavior

in Africa began during a somewhat short and sudden burst

around 50,000 years ago.

It's known as the Human Revolution Theory,

a time when early Homo sapiens showed a major cognitive leap

possibly because of a genetic mutation

or a change in brain function

resulting in more complex language and abstract thought.

But the archaeological record at Panga ya Saidi

seems to fly in the face of the Human Revolution Theory,

showing evidence of prolonged gradual change

much different from other early human

archaeological sites in Africa.

Throughout the excavations,

the researchers discover hearths, ash layers,

and man-made features like pits and hollows.

They also found over 30,000 stone artifacts

which provide this great record

of how tool technologies evolve over time.

If you go back to the earliest inhabitants of the cave,

in the Middle Stone Age, like 78,000 to 73,000 years ago,

you see tools that are characterized

by these large flakes.

Those people were using variations of what's called

the Levallois technique,

where you take a big stone and you chip off fragments of it,

and you make sort of a rounded top and a flat bottom,

almost like a turtle shell.

Artifacts at the site from the later Stone Age,

around 67,000 years ago, show a shift to smaller tools

and a change of material from limestone

to finer-grained quartz or chert.

But what's interesting is that the new tool technologies

did not simply replace the old ones.

Instead, they appear in the same stratigraphic layers,

one dating to roughly between 51,000 and 48,000 years ago

and again, much later,

at around 14,000 to 1,000 years ago.

This tells us that the people who inhabited

Panga ya Saidi may have been an isolated conservative group

resistant to change,

and that the area was not a focal point of innovation.

So while changes may have been occurring

in other parts of Africa,

the people living here

were content with their way of life and customs,

and saw no need to be influenced

by what was happening in other communities.

But this begs the question, what was it about Panga ya Saidi

that made it such a comfortable refuge?

Analysis of ancient biological material

from the site may just provide some insights.

They found animal teeth and remains,

and microscopic traces of plants.

When the data was examined,

it showed that the region around the cave--

the transitional area between grassland savanna

and tropical forest--

remained largely unchanged over the millennia,

which provided the people with a stable supply of resources,

even at times when other areas of Africa

would have been too hostile to sustain life.

One long-held theory holds that innovation

in early humans was mainly caused by having to adapt

to changing climates and environmental conditions.

But that doesn't match the evidence at Panga ya Saidi.

Because despite not facing stresses

induced by their surroundings,

the people here still progressed and evolved,

but didn't do so out of critical necessity;

they did it out of choice.

One of the discoveries

that the research team makes

becomes the most important and surprising.

Under the overhang of the cave, roughly 10 feet deep,

they discovered the remains of a child

between two and a half and three and a half years old.

The body was in a flexed position,

lying on its right side, with knees drawn towards the chest,

suggesting a shrouded burial.

The position of the head showed signs of collapse,

indicating that a support, possibly a pillow,

may have been there at the time of burial.

The remains are dated to the earliest occupation layer

of the site, roughly 78,000 years ago,

making it the oldest known

deliberate human burial in Africa.

It represents not just an early example of funerary practice,

but an important indicator of abstract thought,

cultural nuance, and community care.

And it took place thousands of years before the proposed

Human Revolution Theory supposedly gripped Africa.

Overall, the discoveries at Panga ya Saidi

show that some early humans engaged in prolonged, gradual

technological and social change.

Maybe the people of Panga ya Saidi existed

in an isolated, comfortable environment that allowed them

to evolve organically over a longer period of time.

The picture that emerges

is that at the time of early humans,

Africa was maybe more of a mishmash of distinct cultures

living in vastly different environments,

not a uniform group of people.

Each culture adapted, innovated, and evolved in unique ways,

but they all contributed to the overall origins

of the human species as we know it today.

Like many significant archaeological discoveries,

Panga ya Saidi answers a lot of questions,

but arguably raises even more.

Future excavations may just continue

to further our understanding

of humankind's journey through the millennia.