Caves or cavernes
Fingal’s Cave, Staffa, Scotland
The Cool Hunter - Amazing Places To Experience Around The Globe (Part 1)
Witches Gulch, Wisconsin Dells, USA
Natural Salt Mirror by Peter Rodriguez, via 500px
A Gruta do Lago Azul - Mato Grosso do Sul - Brazil
Devil's Den, Florida one of North America's most prehistoric places, Devil's Den -- an underground spring inside a dry cave in central Florida. The remains of many extinct animals from the Pleistocene Age (2 million - 10,000 years ago) were discovered at Devil's Den, including the bones of early man, dating back to 75,000 B.C.
Cathedral Cove - Coromandel Peninsula, New Zealand
Located in the Coyhaique province, Chile, the Marble Caves are some of the most impressive attractions of Patagonia. Las Cavernas de Marmol, as the Spanish call them were created by the clear waters of Rio Tranquilo that dug into a giant limestone peninsula, creating an impressive labyrinth of caves. The peninsula is known as the Marble Cathedral and can be reached by boat, during a guided tour.
The Marble Caves of Rio Tranquilo, Chile