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Hang Son Doong Cave, Vietnam. Photo by Carsten Peter

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Hang Son Doong (Mountain River Cave), Vietnam

Hang San Doong, "mountain river cave" in central Viet Nam.

HANG SON DOONG, VIETNAM - The “mountain river cave” may be the world’s biggest subterranean passage. A half-mile block of 40-story buildings could fit inside this stretch of the cave.