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National Geographic 2026 - 1 season 10 eps TV-G Returning series

Hidden Beneath the Cities

2026 - 1 season 10 eps TV-G

7.0

Season 1

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Season 1

44 min

S1 · E1 · Apr 24, 2026

Underground Cities and Secret Chambers Episode 1

Scientists uncover a city, a chamber, and a complex, and map a tunnel network.

7.6 · You

44 min

S1 · E2 · Apr 24, 2026

Crystal Cathedrals and Buried Bunkers Episode 2

Scientists uncover salt chambers, bunkers, old kingdoms, and mysterious caves.

7.6 · You

44 min

S1 · E3 · May 1, 2026

Hidden Hypogeum and Lost Letters Episode 3

Investigate a tomb in Naples that may contain a prince who inspired the legend of Dracula. Read the desperate letters of Jewish rebels hidden in an Israeli cave, tour a 6,000-year-old labyrinth in Malta, and see the oldest human burial in Africa.

7.6 · You

44 min

S1 · E4 · May 1, 2026

Tunnels and Tombs Episode 4

Crawl through a notorious brick-lined tunnel system in a historic Florida neighborhood. Open a window into the lives of elite Greek families in Naples, explore a three-story underground city in Iran, and find 2nd-century barracks buried in Rome.

7.7 · You

44 min

S1 · E5 · May 8, 2026

Labyrinths and Legends Episode 5

Explore a labyrinth built beneath Washington, D.C., by an eccentric entomologist. Admire a fresco-filled Roman mausoleum, spot intricate chambers carved into Colombia's volcanic rock, and see a sprawling network of hand-dug tunnels in Liverpool.

7.8 · You

44 min

S1 · E6 · May 8, 2026

Subterranean Secrets and Forgotten Foundations Episode 6

Walk the service tunnels hidden beneath Emperor Hadrian's lavish villa in Italy. Uncover a chilling mass grave from the Thirty Years' War in Germany, find the foundations of a Roman basilica in London, and glimpse Neolithic life on a Danish island.

7.7 · You

44 min

S1 · E7 · May 15, 2026

Buried Battleship and Viking Victims Episode 7

Examine a Revolutionary War-era ship found in the rubble of the World Trade Center. Uncover a mass grave of Viking settlers in Oxford, visit the resistance bunkers of the Warsaw Ghetto Uprising, and tour a necropolis full of burial jars in Corsica.

44 min

S1 · E8 · May 15, 2026

Bones Beneath and Coffins & Coins Episode 8

Dig beneath the Treasury in Petra, Jordan, to find a sealed tomb containing 12 skeletons; unearth a hoard of coins hidden during a Scottish massacre, question the purpose of an empty grave in Peru, and inspect a Bronze Age leader's coffin in England.

44 min

S1 · E9 · May 22, 2026

Subterranean Seoul and Railway Revealed Episode 9

Discover a massive underground chamber hiding under the Seoul subway. Visit a medieval knight's limestone tomb in Poland, examine Roman ruins beneath a church in England, and ponder the identity of a 10-million-year-old fossil in Los Angeles.

44 min

S1 · E10 · May 22, 2026

Secret School and Concealed Castle Cemetery Episode 10

Visit a strange wood-lined tunnel beneath a Copenhagen train station. Locate one of North America's earliest schools for Black children in Virginia, excavate a warrior cemetery in Finland, and unearth a women-only burial plot beneath a Welsh castle.

10 episodes in Season 1

Some details come from TheTVDB.

Uncovers the extraordinary worlds lying just below modern urban centers. Beneath the streets of stone, soil and concrete exist hidden realms shaped by survival, ritual and imagination. Uncovers the extraordinary worlds that exist beneath major urban centers, from the tombs and wartime shelters of Naples to the manmade Royston Cave in Hertfordshire, England.

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Total runtime 7h 20m · Episode length 44 min · Type Documentary

Show info

Premiered

April 24, 2026

Latest episode

May 22, 2026

Status

Returning series

Network

National Geographic

Country

United States

Type

Documentary

Episode length

44 min

Total runtime

7h 20m

Original language

English

Production

N

National Geographic

Production

S

Shark Teeth Films

Production

United States · Canada

Produced in

Languages

Spoken on screen

English

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