Discovered while drilling in a lead and silver mine, this “Cave of Crystals” lies nearly 1000 feet below the Chihuahuan Desert in Mexico. The giant crystals dwarf humans, with the biggest one measuring 37.4 feet long. Up to 170 huge crystals can be found in this impressive cave.

The crystals were formed from groundwater saturated in calcium sulphate which began flowing through the cave millions of years ago as it was heated by an intrusion of magma about a mile below.

The magma began to cool around 600,000 years ago and the minerals started to precipitate out of the water. The crystals grew to be massive over time, until miners, unknowingly, drained the cave in 1985.

Although the pictures might be deceiving and give off the impression that the cave is cold, the temperature is actually around 45 degrees Celsiues (113 degrees Fahrenheit) with nearly 100% humidity.