Son Doong Cave is large enough to hide a skyscraper inside
Vietnam’s Son Doong Cave holds passages so vast that a 40-story skyscraper could stand inside the largest chamber with room to spare — among the biggest known cave volumes on Earth.
Collapsed ceilings open jungled skylights; an underground river carved the limestone over millions of years in Phong Nha–Ke Bang.
Caves are inverted mountains. Son Doong proves emptiness can be monumental when water and time excavate the dark.
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