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Cave of the Crystals or Giant Crystal Cave is a cave connected to the Naica Mine 300 metres (980 ft) below the surface in Naica, Chihuahua, Mexico. The main chamber contains giant selenite crystals (gypsum, CaSO4·2 H2O), some of the largest natural crystals ever found. - Credit:

from Ultimate Places

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Blue Grotto Cave in Capri, Italy

Spar crystals in the Aragon Room of Soldiers Cave, Sequoia & Kings Canyon NP, CA. These crystals, which are several inches long, formed under water.