Episode 1
Underground Cities and Secret Chambers
45m
Scientists uncover a city, a chamber, and a complex, and map a tunnel network.
Where to watch Hidden Beneath the Cities
TV series
Hidden Beneath the Cities
2026TV-PG1 season
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.
Availability
Not streaming in United States
Hidden Beneath the Cities premiered April 24, 2026. We don't have a confirmed streaming, rental or purchase option yet.
Synopsis
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.
Season 1 episodes
Choose an episode, then use the watch options above for the show.
Episode 2
Crystal Cathedrals and Buried Bunkers
45m
Scientists uncover salt chambers, bunkers, old kingdoms, and mysterious caves.
Where to watch Hidden Beneath the Cities
Episode 3
Hidden Hypogeum and Lost Letters
45m
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.
Where to watch Hidden Beneath the Cities
Episode 4
Tunnels and Tombs
45m
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.
Where to watch Hidden Beneath the Cities
Episode 5
Labyrinths and Legends
45m
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.
Where to watch Hidden Beneath the Cities
Episode 6
Subterranean Secrets and Forgotten Foundations
45m
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.
Where to watch Hidden Beneath the Cities
Episode 7
Buried Battleship and Viking Victims
45m
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.
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Episode 8
Bones Beneath and Coffins & Coins
45m
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.
Where to watch Hidden Beneath the Cities
Episode 9
Subterranean Seoul and Railway Revealed
45m
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.
Where to watch Hidden Beneath the Cities
Episode 10
Secret School and Concealed Castle Cemetery
45mfinale
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.
Where to watch Hidden Beneath the CitiesEpisode information updated Jul 25, 2026
Available now in United States
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More about Hidden Beneath the Cities
Production details
- Status
- Returning Series
- Series type
- Documentary
- Episodes
- 10
- Original language
- English
Networks & production
National GeographicUnited States
National GeographicUnited States
Shark Teeth FilmsCanada