Caves of Crystals.

Places where Superman could feel at home. Mexico's Cueva de los Cristales contains some of the world's largest known natural crystals - tanslucent gypsum beams measuring up to 36 feet (11 meters) long & weighing up to 55 tons.

Modern-day mining exposed the natural wonder by pumping water out of the 30-by-90-foot (10-by-30-meter) cave, which was found in 2000 near the town of Delicias. "There is no other place on the planet," García-Ruiz said, "where the mineral world reveals itself in such beauty."

(Image credit: Nationalgeographic).




(Image credit: Crystalinks).

(Image credit: Canyonsworldwide).

Similarly there is a huge cave of crystals in an old silver mine in Spain.

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