Notable examples include National Geographic’s “Into the Lost Crystal Caves” and ... to exist on other planets. The Cave of ...

Looters stole a cave painting and damaged others with an electric saw at La Cueva Pinta, photos show and officials said. Photo from Mexico’s National Institute of Anthropology and History ...

NGC goes inside one of the greatest natural marvels on the planet - a giant crystal cave described as Superman's fortress, with magnificent crystals up to 36 feet long and weighing 55 tons.