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Son Doong Cave
Phong Nha National Park has enormous caves, including the largest-known cave on the planet, Son Doong Cave. Discovered in 1991, by a local who dared not venture inside, the cave wasn’t fully explored until 20 years later. At more than 3 miles (5 km) long, 656 feet (200 m) high and 49 feet (15 m) wide, it is the largest known cave passage in the world.