Hang Son Doong: Discovered by a Vietnamese farmer in 1991, the 3-million-year-old Hang Son Doong Cave is the largest known cave passage in the world by volume -- it's so big it could hold a New York City block. Located inside UNESCO-listed Phong Nha-Ke Bang National Park, this mystical subterranean world features a rushing river, enormous stalagmites and otherworldly shards of light. It's open to limited number of visitors each year, with tours conducted by Oxalis from February to August. |
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