Deep underneath Mexico's Chihuahua Desert (1000 ft approximately) lay a giant cave filled with hidden gems - razor sharp naturally formed crystals. Known as the Crystal Cave of Giants, this chamber lies in the Naica Mine and was discovered by two brothers drilling in the mine for, of course, crystals.
The largest crystal on record is 55 tons and measures 36 feet long! Incredibly beautiful, the cave is also extremely dangerous due not only to the large sharp-edged crystals everywhere, but also to the temperature at a constant 112F. The tremendous humidity require whoever enters to wear special suits and masks with cooled air in backpacks to survive. Reason #1,670,093,904 why nature is so incredible.
Images via Planet Oddity.