Estimfalos: 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. Photos By Carsten Peter, National Geographic
we-should-fuck-now-that-i: fluorideuraniumcarbonpotassium: So I made a shirt. Very nice shirt :D ♥
