Which spectacular natural wonder in Vietnam is recognized as the world's largest cave by cross-section?
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Hang Son Doong is so massive that it has its own localized weather system, complete with clouds and rain. Discovered by a local man in 1991 and fully explored in 2009, some of its chambers are tall enough to fit an entire block of forty-story skyscrapers. Photo: Doug Knuth from Woodstock, IL, Wikimedia Commons, CC BY-SA 2.0.
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Source: Wikipedia (CC BY-SA)
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