The TelegraphHidden deep beneath the surface of the Earth is one of the greatest natural marvels on the planet: a giant crystal cave packed with crystals up to 36 feet long and weighing 55 tons.
Buried a thousand feet below Naica mountain in the Chihuahuan Desert of Mexico, the cave was discovered by two miners excavating a new tunnel for a commercial lead and silver mine.
Known as Mexico's Cueva de los Cristales (Cave of Crystals) it contains some of the world's largest known natural crystals–translucent beams of gypsum as long as 36 feet and softer than human nails.
The crystals thrived in the cave's extremely rare and stable natural environment. Temperatures hovered consistently around a steamy 136 degrees Fahrenheit (58 degrees Celsius), and the cave was filled with mineral-rich water that drove the crystals' growth.
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