Marble Caves—Patagonia, Chile
2. Skaftafell Ice Caves—Vatnajökull National Park, Iceland
3. Man-Made Caves—Dolomites, Italy
4. Reed Flute —Guangxi, China
5. Son Doong Cave—Phong Nha-Kẻ Bàng National Park, Vietnam
Initially found by a local man in 1991, the Son Doong in Viestnam was fully discovered in 2009, making it the largest known cave in the world. The name translates to “mountain river cave” and there is, in fact, a quick-moving river within the cave, which is how the was initially formed sometime between 2 and 5 million years ago.
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