In the case of the Cave of Crystals, the giant selenite beams formed as a result of volcanic activity roughly 26 million years ago. Rising magma below the Chihuahua region created a mountain and ...

Whoever first said that true beauty lies beneath the surface may have been inspired by the incredible environment hidden ...

Crystal Cave in Sequoia National Park, California, reopens for the season, offering guided tours and a magical underground experience after a 4-year closure.

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.