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TVPGHDHidden Beneath the Cities1hNational Geographic

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

Original Air Date: Mar 18, 2026

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

Original Air Date: Mar 18, 2026

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National Geographic • Tomorrow, 1:00am • 1h

Hidden Beneath the Cities

S1, EP1 "Underground Cities and Secret Chambers"

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

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Hidden Beneath the Cities

S1, EP2 "Crystal Cathedrals and Buried Bunkers"

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

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Hidden Beneath the Cities

S1, EP3 "Hidden Hypogeum and Lost Letters"

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

National Geographic • Sat May 02, 2:00am UTC • 1h

Hidden Beneath the Cities

S1, EP4 "Tunnels and Tombs"

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

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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