A self-built castle made by a mysterious man.

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

Most-visited and most-photographed slot canyon in the American Southwest.

Rippling sand dunes frozen in the Arizona rock.

Iceland's "Smoky Valley" is a beautiful river that is shrouded in a constant cover of steam clouds.

Nestled in the hills of Tuscany are gorgeous, multicolored hot springs.

Europe's oldest still-operational tea farm also boasts a spectacular view.

Northern Ireland's Brobdingnagian stepping stones.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

This tangled English forest looks like something right out of a fairytale.

An ancient stone fortress considered by many to be the eighth wonder of the world.

Filled with goldfish swimming in a shallow pool of sea water, this ancient crypt is more wishing well than burial site.

This 6th-century church has the largest and best-preserved collection of Byzantine mosaics outside Constantinople.

Ruins of a 10th century church tucked away deep in a botanical garden.

This remote island village was in danger of depopulating completely until a tunnel was built to connect it to the rest of the world .

An old hill fort covered in over 100,000 crosses is a symbol of Lithuanian nationalism and beliefs.

Islanders once used this dramatic, otherworldly landscape to hide their cattle from Viking raiders.

A red sandstone freestanding monolith rises out of the sea in northern Scotland.

Ancient cliffs resembling a kilt on Scotland's second largest island emit an entrancing sound.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

In Paris, Texas they have their own Eiffel Tower, it just has a cowboy hat on it.

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.