January 20, 2016

Hang Son Doong, Vietnam

Photograph by Ryan Deboodt, Aurora Photos

Vietnam’s Hang Son Doong stands as proof that the world still has wonders yet to be uncovered. First explored in 2009, the colossal cave is big enough to house an entire city block of 40-story buildings and has an underground river and jungle. Part of the reason the cave’s ecosystem is able to function is this doline, or sinkhole, that allows sunlight to enter.

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