The Mulu Caves are located in the Gunung Mulu National Park in Borneo
The Cave of Crystals Naica Mine in Northern Mexico.
Reed Flute Cave by howardignatius, via Flickr...located in the northwest of Guilin in southern China. People believed that the reed by the cave's mouth could be made into flutes. Limestone cave offers fairyland of stalactites, stalagmites, stone pillars, stone curtains, birds, plants and animals in fantastic shapes and colors.
Reed Flute Cave
Lechuguilla Cave, Carlsbad Caverns National Park, New Mexico. It is the fifth longest cave (122 miles (196 km)) known to exist in the world, and the deepest in the continental United States (1,604 feet (489 m)), but it is most famous for its unusual geology, rare formations, and pristine condition. Access to the cave is limited to approved scientific researchers, survey and exploration teams, and National Park Service management-related trips. Photographer unknown.
9 Beautiful Caves View in the world – DesignSwan.com