15) Hang Son Doong, Vietnam
Vietnamese cave Hang Son Doong snags the top spot as the world’s largest cave. Located in UNESCO-crowned Phong Nga Ke Bang National Park in Quang Binh Province, this cave is roughly 3 million years old. It runs for 9km, with the largest cave passage dominating 5km of the total. Several areas of collapsed ceiling have allowed sunlight to stream through the cracks, resulting in tree and vegetation growth in the cave’s interior. A large, fast-flowing prehistoric river runs through the Hang Son Doong and is one of the reasons it was discovered just 16 years ago. The sound of the wind whistling through the enormous cavern and the rushing river alerted a local man to the caves’ existence. However, it wasn’t until 2009 that the British Cave Research Association officially discovered the cave. The river, reflecting pool, and views looking out through the massive cave entrance are the main highlights.
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