1. Mammoth Cave (USA)
2. Dongzhong Cave (China)
3. The Reed Flute Cave (China)
4. Cappadocia Cave City (Turkey)
5. Ice Caves (Antarctica)
6. Lechuguilla Cave (New Mexico)
7. The Underwater Caves of The Riviera Maya (Mexico)
8. Underwater Caves (Fiji)
9. Onondoga Cave (Missour)
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