crystal cave ( island of Bemuda)
The Bellamar Cave (Cuba)
The Blue Lake Cave (Brazil)
Naica Crystal Cave (Mexico)
Grotto Of The Marvels (Spain)
Enchanted Well - Chapada Diamantina National Park (Brazil)
Caves of Mira D'aire (Portugal)
Mogao Grotto (China)
Jeita Grotto(Lebanon)
Cacahuamilpa Grotto (Mexico)
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