Season
Episode
E1Underground Cities and Secret ChambersApr 24, 202645mE2Crystal Cathedrals and Buried BunkersApr 24, 202645mE3Hidden Hypogeum and Lost LettersMay 1, 202645mE4Tunnels and TombsMay 1, 202645mE5Labyrinths and LegendsMay 8, 202645mE6Subterranean Secrets and Forgotten FoundationsMay 8, 202645mE7Buried Battleship and Viking VictimsMay 15, 202645mE8Bones Beneath and Coffins & CoinsMay 15, 202645mE9Subterranean Seoul and Railway RevealedMay 22, 202645mE10Secret School and Concealed Castle CemeteryMay 22, 202645m
Hidden Beneath the Cities
20266
Documentary
Released
Apr 24, 2026
Country
United States
Productions
National GeographicShark Teeth Films
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 centers, from the tombs and wartime shelters of Naples to the manmade Royston Cave in Hertfordshire, England.