Hang Son Doong, the “mountain river cave” in Vietnam, may be the world’s biggest subterranean passage. A half-mile block of 40-story buildings could fit inside this stretch of the cave.

Hang Son Doong, the “mountain river cave” in Vietnam, may be the world’s biggest subterranean passage. A half-mile block of 40-story buildings could fit inside this stretch of the cave.

Awesome website. Type in your starting destination and your ending destination, and it will find ALL SORTS of things for you to do, see, eat, play along the way. Will be so happy I pinned this!!!

Awesome website. Type in your starting destination and your ending destination, and it will find ALL SORTS of things for you to do, see, eat, play along the way. Will be so happy I pinned this!!!

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