Hang Son Doong: Inside the World's Largest Cave (PHOTOS)
Nov 2, 2024
A Hang Son Doong explorer navigates a plant-covered cavescape. Phong Nha Ke Bang National Park, Vietnam. (Carsten Peter/National Geographic/Getty Images) Almost six miles long,650ft-wide and 550ft-tall, in Quang Binh province in Vietnam is so big, it can fit a 40-story skyscraper. But the cave, which was created 2-5 million years ago by river water eroding limestone underneath a mountain, actually remained undiscovered until 1991 and unexplored until 2009. Now, tourists can explore the mythical cave, considered the world's largest, thanks...