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Reed Flute Cave in Guilin, China was discovered during the Tang Dynasty almost 1,300 years ago.



2. Pool Preserve, in Austin,





3. Hamilton Pool from another perspective.



4. Stalagtites adorn the roof of Luray Caverns, Virginia, the still waters throwing a perfect reflection.



5. Legend has it that early cavemen inhabited Wookey Caves in Somerset, England.



6. This underground lake in Mellisani Caves, near Kefalonia, was found when the roof of the cave collapsed after an earthquake in 1953.



7. Lechuguilla Cave, in Carlsbad Caverns National Park, New Mexico i



8. This underground lake near Macan Ché on the Yucatán Peninsula



9. The limestone flow feeding into this underground lake in Mexico



10. How long must it have taken for this little waterfall in Banff, Canada, to make this underwater lake?