Recently opened to the public (that is, to individuals who can pay $3,000 plus a flight to Vietnam for a guided adventure tour), Hang Son Doong cave is the largest cave in the world. Guarded by the lush and treacherous jungle of Vietnam’s Phong Nha-Ke Bang National Park near the Laos border, the cave was first discovered in 1991 by a local man named Ho Khanh; it was later rediscovered by British explorers in 2009.
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