Hidden Beneath The Cities
National Geographic2 upcoming
Crystal Cathedrals and Buried Bunkers: Marvel at Poland's salt mine, explore a Cold War bunker, uncover an ancient Egyptian site and probe China's mysterious Longyou Caves. (S1, ep 2) 7+
Saturday 15 August
14:00National Geographic
1h·S1 E1
Underground Cities and Secret Chambers: From underground churches to carved sacred chambers, hidden sites show how ancient communities created refuges for faith. (S1, ep 1) 7+
15:00National Geographic
1h·S1 E2
Crystal Cathedrals and Buried Bunkers: Marvel at Poland's salt mine, explore a Cold War bunker, uncover an ancient Egyptian site and probe China's mysterious Longyou Caves. (S1, ep 2) 7+