Hang Sơn Đoòng

Photo

by Dave Bunnell

/ CC BY-SA 4.0

Hang Sơn Đoòng, located in Phong Nha-Kẻ Bàng National Park in Vietnam, is recognized as the largest cave passage in the world by volume. Discovered in 1991 by a local man named Hồ Khanh and later explored by British cavers in 2009, this magnificent cave features towering stalagmites, underground rivers, and its own localized weather system. The immense size of the cave can accommodate a block of 40-story buildings, and it even has sections where sunlight penetrates through collapsed ceilings, allowing for the growth of lush jungle inside.

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