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Photograph by Peter Carsten


Hand of Dog stalagmite in Hang Son Doong Cave

A spelunker takes a close look at the Hand of Dog stalagmite in Hang Son Doong Cave. The "Mountain River Cave", in a remote part of Vietnam's Annamite Mountains, was first explored in 2009 and boasts caverns large enough to hold a 747 airplane. In fact, though explorers have only scratched the cave's surface it may be the world's largest with continuous passages as wide as 300 feet (91 meters) stretching more than 600 feet (183 meters) high. -- http://science.nationalgeographic.com/

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