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TVPGHDHidden Beneath the Cities1hNational Geographic
Explorers discover tunnel systems, a sprawling city, and military barracks.
Explorers discover tunnel systems, a sprawling city, and military barracks.
How to watch
Available on demand
More episodes
Hidden Beneath the Cities
S1, EP10 "Secret School and Concealed Castle Cemetery"A mysterious tunnel, colonial ruins and warrior cemeteries are exposed.
Hidden Beneath the Cities
S1, EP8 "Episode 8"Old Tombs, buried coins, and a 4,000-year-old oak log coffin are discovered.
Hidden Beneath the Cities
S1, EP6 "Subterranean Secrets and Forgotten Foundations"Explorers find a tunnel system, mass graves, city foundations, and longhouses.
Hidden Beneath the Cities
S1, EP4 "Tunnels and Tombs"Explorers discover tunnel systems, a sprawling city, and military barracks.
Hidden Beneath the Cities
S1, EP10 "Secret School and Concealed Castle Cemetery"A mysterious tunnel, colonial ruins and warrior cemeteries are exposed.
Hidden Beneath the Cities
S1, EP9 "Subterranean Seoul and Railway Revealed"Underground chambers, medieval tombs, old ruins and fossils are uncovered.
Hidden Beneath the Cities
S1, EP8 "Episode 8"Old Tombs, buried coins, and a 4,000-year-old oak log coffin are discovered.
Hidden Beneath the Cities
S1, EP7 "Episode 7"A buried ship, wartime cellars, jar burials and mass graves are excavated.
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.
Original Air Date: Feb 25, 2026
Genres: DocuseriesTV Series
Rating: TVPG
Playback: HD
1 seasons available on demand
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