This massive library holds what was once the largest book collection in the world.

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

A 16th-century horror show built in a lovely Italian garden.

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

Notorious artist squat renovated into legal studios.

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

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

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

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Dramatic river bend surrounds a natural red-rocked pedestal.

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

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.