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

A kaleidoscopic warehouse-maze of handmade neon signs.

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

A bizarre house filled with an astounding array of collections.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

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

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

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

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

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

The legendary building that needed ghostly approval before being built.

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

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

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

An eerie, derelict amusement park in Berlin.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

An emerald-green grotto just a short trip from Austin.

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

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

Tucked in the back of this amazing antique store is an important piece of medical history.

A crumbling hospital from the 1850s on Roosevelt Island.

World's first "penitentiary," meant to be humane, drove men insane.

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