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Vietnam's Mammoth Cavern - Interactive Graphic - National Geographic Magazine The feat of exploring Hang Son Doong begins right at the entrance, where author Mark Jenkins picks his way across mossslick boulders. A local hunter years earlier had discovered the opening after seei…

Cave of Crystal Giants — National Geographic Magazine In a nearly empty cantina in a dark desert town, the short, drunk man makes his pitch. Beside him on the billiards table sits a chunk of rock the size of home plate. Dozens of purple and white crystal…

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