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Algarve Coast, Portugal
Illuminated Caves, Okinawa, Japan (Ocean of Milk)
On the path to King's Cave, Isle of Arran, Scotland
Slovenian Caves - the Grand Canyon of the underground.
Ruby Falls cave, Tennessee
Ice cave (inside of a glacier) I couldn't imagine seeing this in person, I would probably start crying while having spasms on the ground. -.-
calcareous cave by * Yumi *, via Flickr
Chapada Diamantina - Poço Encantado, Brazil
Melissani Cave, Kefalonia, Greece
Glowworm Caves in Waitomo, New Zealand