The Largest Crystals In The World At Naica Crystal Cave, Mexico

Planet Earth

Dig in deep into the Naica Crystal Caves in Chihuahua, Mexico, and get nothing less than massive crystals. The cave conditions are extreme: it has a constant temperature of 58 degrees Celcius (136 °F) and very high humidity.

Trekkers are given a suit full of icebags with a respirator when they had to explore the cave. And they got to move quickly because the longer your stay in there, the more you lose your brain functions.