Cave of the Crystals
The truth is, any one of these caves could be your number one cave. I just didn’t select the Cave of the Crystals because it would’ve been cliché. I mean, look at the gypsum. These massive crystals formed as groundwater in the cave was heated by a magma chamber further beneath the Earth. The water was abundant in anhydrite, which dissolved into gypsum. Some of the crystals are 36 feet long and weigh up to 55 tons, according to National Geographic.
