This golden temple is surrounded by hundreds of stone tablets that comprise the "world's largest book."

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

A limestone wonderland of water and subterranean secrets.

Clusters of huge boulders in the Australian Outback.

A meteorite-bounded town in Bavaria.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.