Deep in the jungles of central Vietnam, hidden behind dense forest and roaring underground rivers, lies a cave so enormous that a Boeing 747 could fly through its largest chamber without touching a wall. Son Doong, officially the world's largest known cave passage, stretches 5.6 miles in length and rises as high as 65 stories in places. Its caverns are wide enough to hold a football field and a half, and large enough to contain the Great Pyramid of Giza. But for all its overwhelming scale, this geological giant spent decades completely unknown to the world and even after it was first stumbled upon, it took nearly two decades to find it again.
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