Son Doong Cave
In 2009, a Vietnamese farmer named Ho Khanh showed British spelunkers the entrance to a cave he'd known since childhood. What they found inside rewrote all records: the largest cave passage on Earth, where a 40-story skyscraper could fit, with its own jungle, clouds, and river. Son Doong—"Mountain River Cave"—turned out to be so enormous that people compared it to another planet.
A Scale Beyond Comprehension
Son Doong's main passage reaches 200 meters in height, 175 meters in width, and stretches over 5 kilometers. The cave has its own weather: humid air rises and condenses into clouds benea...
