Into the Crystal Cave

Into the Crystal Cave

National Geographic  |  December 23, 2016

A team of experts ventures back into Mexico's giant crystal cave. Described as Superman's fortress, the cave is as deadly as it is beautiful. But could it lead to another, more spectacular cave?

A team of experts ventures back into Mexico's giant crystal cave. Described as Superman's fortress, the cave is as deadly as it is beautiful. But could it lead to another, more spectacular cave?

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