S1 E145 min
Underground Cities and Secret Chambers
Scientists uncover a city, a chamber, and a complex, and map a tunnel network.
Hidden Beneath the Cities
Season 1
Hidden Beneath the Cities 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 centres, from the tombs and wartime shelters of Naples to the man made Royston Cave in Hertfordshire, England.
10 episodes · First aired 2026-04-24
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Episodes
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Showing 10 at a time
S1 E245 min
Crystal Cathedrals and Buried Bunkers
Scientists uncover salt chambers, bunkers, old kingdoms, and mysterious caves.
S1 E345 min
Hidden Hypogeum and Lost Letters
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.
S1 E445 min
Tunnels and Tombs
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.
S1 E545 min
Labyrinths and Legends
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.
S1 E645 min
Subterranean Secrets and Forgotten Foundations
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.
S1 E745 min
Buried Battleship and Viking Victims
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.
S1 E845 min
Bones Beneath and Coffins & Coins
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.
S1 E945 min
Subterranean Seoul and Railway Revealed
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.
S1 E1045 min
Secret School and Concealed Castle Cemetery
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.