Hang En Cave, Vietnam - Photograph by Carsten Peter, National Geographic Going underground, expedition members enter Hang En, a cave tunneled out by the Rao Thuong River. Dwindling to a series of ponds during the dry months, the river can rise almost 300 feet (91 meters) during the flood season, covering the rocks where cavers stand. Places To Visit, World Largest, National Geographic, Peter O'Tool, Largest Caves, National Parks, Photo, Sons Doong Caves, Cool Places
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UNESCO World Heritage Site - Royal Architecture, Imperial City, Hue, Vietnam (Đại Nội, Huế, Hoàng cung, Kiến trúc cung đình)
Belize ... This is called the ATM Tour or ATM Cave. It's amazing, you swim in with headlamps on and climb rocks and ladders to get to different levels. On each 'platform' you observe different artifacts. It's pitch dark inside with flowing water. Once in a lifetime tour, there are 25 guides that go through special training to be allowed to take tourists in the cave.