An engineering error ensured this cavernous 350-foot-long subterranean thoroughfare was never used as intended.

Rainbow-hued in the summer and crystalline in the winter, this salty lake has inspired battles, temples, and plenty of awe.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.