Started as a kitchen garden, now the second largest botanical garden in the world.

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

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

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

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

Remants of foundations, streets, and streetcar tracks inhabit the cliffs where a landslide occurred in 1929.

The sign at the garden gate reads: "These Plants Can Kill."

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

The world's only museum devoted to the wonders of fluorescence.

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

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

A kaleidoscopic warehouse-maze of handmade neon signs.

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

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

This faux-seedy Japanese arcade is made up to look like a maze of alleys straight out of a cyberpunk dystopia.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

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

An eerie, derelict amusement park in Berlin.

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

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

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

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

An exquisite tunnel of cascading flowers.

Rippling sand dunes frozen in the Arizona rock.