This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

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

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

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

Abandoned railway line circling the city of Paris.

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

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

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

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

The only structure left with direct ties to the Salem witchcraft trials of 1692.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

New York's oldest magic store.

Hot springs monkey spa in the middle of Hell's Valley.

A bizarre house filled with an astounding array of collections.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

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

These old stone ruins in the Oregon wilderness were once bathrooms and are steeped in legends of murder.