This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

Medicinal spa created with the discharge from a geothermal energy plant.

The fairy tale castle of the "fairy-tale king."

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

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

These fantastically named natural pools look like something out of a Scottish myth.

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

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

A psychedelic labyrinth on the San Francisco bay.

Camels and crocodiles share the black waters of this stunning Saharan oasis.

This stunning waterfall is the backdrop to a site that has seen continuous human habitation for 250,000 years.