Description
Original Airdate02/24/2026
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.
Hidden Beneath the Cities
Where to watch Hidden Beneath the Cities
- Free On Demand on National Geographic, through Oct 20, 2026
Cast & Crew
Jeff TeravainenNarrator Jeff TeravainenNarrator
Season 1
10. Secret School and Concealed Castle Cemetery
Air Date 04/29/2026
A mysterious tunnel, colonial ruins and warrior cemeteries are exposed.
9. Subterranean Seoul and Railway Revealed
Air Date 04/22/2026
Underground chambers, medieval tombs, old ruins and fossils are uncovered.
8. Bones Beneath and Coffins and Coins
Air Date 04/15/2026
Old Tombs, buried coins, and a 4,000-year-old oak log coffin are discovered.
7. Buried Battleship and Viking Victims
Air Date 04/08/2026
A buried ship, wartime cellars, jar burials and mass graves are excavated.
6. Subterranean Secrets and Forgotten Foundations
Air Date 04/01/2026
Explorers find a tunnel system, mass graves, city foundations, and longhouses.
5. Labyrinths and Legends
Air Date 03/25/2026
Volunteers unearth tunnel systems, and a sealed burial tomb is found.
4. Tunnels and Tombs
Air Date 03/18/2026
Explorers discover tunnel systems, a sprawling city, and military barracks.
3. Hidden Hypogeum and Lost Letters
Air Date 03/11/2026
Archaeologists find a tomb, a haunting cave, and a sophisticated labyrinth.
2. Crystal Cathedrals and Buried Bunkers
Air Date 03/03/2026
Scientists uncover salt chambers, bunkers, old kingdoms, and mysterious caves.
1. Underground Cities and Secret Chambers
Air Date 02/24/2026
Scientists uncover a city, a chamber, and a complex, and map a tunnel network.