Monasteries on rock pillars, once accessible only by frayed ropes.

One of the oldest medical collections in Europe focusing on rare surgical instruments.

A hotel and restaurant serving as the mecca of kitsch.

A seemingly endless landscape of pure salt stretches far across Bolivia.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

Odd outsider art installations surround a Gold Rush-era ghost town.

Stroll through a wonderland of stupendous moss-covered trees.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

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

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

This Boston medical museum features the skull of the famous medical case of Phineas Gage.

The real life Hobbiton, this sheep farm has been forever transformed since being built for The Hobbit film series.

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

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

The legendary building that needed ghostly approval before being built.

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

An eerie, derelict amusement park in Berlin.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

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

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