In 1985, a fantasy world of crystals was discovered in a silver mine 1,000 feet below Mexico’s Chihuahua Desert.

The 600,000 year old cave contains 170 crystal obelisks that measure up to 37 feet. Millions of years ago, these giant obelisks formed when retreating magma caused the chamber’s calcium rich groundwater to cool.

Today, the cave reaches 112 degrees F, requiring explorers to wear protective suites and backpacks filled with ice-cooled air.