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.
(via gnostic-forest)
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.
(via gnostic-forest)
