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Hidden Beneath the Cities

7:00 PM to 8:00 PM
Sunday 14 June
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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 HD at 7:00 PM, Sunday 14 June. (New, subtitles.)
Topics
News ➝ Current Affairs
Documentary