The Cave of Crystals in Chihuahua, Mexico, is buried almost 1,000 feet (300 meters) beneath Earth's surface and contains giant gypsum crystal beams that are up to 37 feet (11 m) long.

Known as Cueva de los Cristales (Cave of Crystals), this hidden chamber in Mexico holds some of the largest natural crystals ever discovered. The translucent pillars, some as long as telephone ...