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National Geographic

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.

Hidden Beneath the Cities

Secret School and Concealed Castle Cemetery

Discovering a massive underground chamber hiding under the Seoul subway; visiting a medieval knight's limestone tomb in Poland; examining Roman ruins beneath a church in England; pondering the identity of a 10-million-year-old fossil in Los Angeles.

Subterranean Seoul and Railway Revealed

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.

Episode 8

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.

Episode 7

Passionate storytelling that brings adventure, exploration, culture and natural wonders to life.

Explorers find a tunnel system, mass graves, city foundations, and longhouses.

Subterranean Secrets and Forgotten Foundations

Volunteers unearth tunnel systems, and a sealed burial tomb is found.

Labyrinths and Legends

Explorers discover tunnel systems, a sprawling city, and military barracks.

Tunnels and Tombs

Archaeologists find a tomb, a haunting cave, and a sophisticated labyrinth.

Hidden Hypogeum and Lost Letters

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

Crystal Cathedrals and Buried Bunkers

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

Underground Cities and Secret Chambers

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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.

S1 E7 | Episode 7