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Lesser-known stunning vacation destinations

Photos Logo Photos Slide 1 of 18: The world's biggest cave Hang Son Doong is located in the heart of the Phong Nha-Ke Bang National Park in Vietnam. It stretches more than 5 kilometers long with the height of nearly 200 meters.

Hang Son Doong, Vietnam

Located in the center of the Phong Nha Ke Bang National Park, the world’s largest cave only opened to the public in 2013. Visitors can trek through, or camp inside the cave under supervision.

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