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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.
First Aired
Apr 24, 2026
Last Aired
May 22, 2026
Seasons
1
Episodes
10
Network
National Geographic
Studio
National Geographic, Shark Teeth Films
