Whoa. That's real. Hang Son Doong Cave, Vietnam - A half-mile block of 40-story buildings could fit inside this lit stretch of Hang Son Doong, which may be the world’s biggest subterranean passage. source.
Wednesday, February 9, 2011
Hang Son Doong Cave, Vietnam
Whoa. That's real. Hang Son Doong Cave, Vietnam - A half-mile block of 40-story buildings could fit inside this lit stretch of Hang Son Doong, which may be the world’s biggest subterranean passage. source.
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