As such, they are believed to be the purest form of selenite crystal in the world. The Cave of the Crystals, or Cueva de los cristales, as it was dubbed, is a horseshoe-shaped chamber roughly 358 ...

Naica’s Crystals Cave, maybe the most amazing underground wonder on Earth, was discovered by chance inside the deep mine of Naica, in the State of Chihuahua, Mexico. It is a true geode: a cave ...