One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

A church of bones, decorated with 40,000 human skeletons.

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

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

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

Notorious artist squat renovated into legal studios.

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

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

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

France's most famous cemetery, with some of its most curious tombs.

Dramatic river bend surrounds a natural red-rocked pedestal.

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

A 140-year-old castle with underground caves hidden in San Francisco.

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

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

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

On the Oregon coast there is a natural hole that seems to be draining the sea.

An eerie, derelict amusement park in Berlin.

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

Rippling sand dunes frozen in the Arizona rock.

World's largest collection of serial killer artwork and other macabre exhibits.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.

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