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Hidden Beneath the Cities

12:00 PM to 1:00 PM
Wednesday 17 June
+

Crystal Cathedrals and Buried Bunkers

Season 1 Episode 2

Poland's salt mine, a Cold War bunker, an ancient Egyptian site, and China's mysterious Longyou Caves.

Hidden Beneath the Cities airs on National Geographic Channel +1 at 12:00 PM, Wednesday 17 June. (Subtitles.)
Topics
News ➝ Current Affairs
Documentary