Mexico's Enchanted Crystal Cave, also known as the Cave of the Crystals, is a natural wonder located about 1,000 feet below the surface in Naica mine in the state of Chihuahua. The cave was discovered in 2000 by miners who were drilling through a lead-zinc mine. The cave's name comes from its incredible crystal formations, which are among the largest in the world.

The cave's crystals are made of gypsum and range in color from transparent to white to golden. The largest crystals are up to 36 feet long and weigh up to 55 tons. The cave is incredibly hot, with temperatures reaching up to 136 degrees Fahrenheit (58 degrees Celsius) and humidity levels near 100%. The conditions in the cave are so extreme that visitors can only stay for a short time, and must wear special suits and equipment to protect themselves from the heat and humidity.

Despite its challenging conditions, the Enchanted Crystal Cave has become a popular destination for scientists and tourists alike. The cave's crystals are studied by researchers to learn more about the formation of crystal structures, while tourists come from around the world to marvel at the cave's stunning natural beauty. The cave is also considered to be a sacred site by some indigenous groups, who believe that the crystals have spiritual and healing properties.