A cave dwelling that was started by the Celts, expanded by monks, and finished by knights.

This concrete ship has had four careers - World War I tanker, floating amusement park, fishing pier, and artificial reef.

Experience the "opulence, grace, and grandeur of Eureka's most famous Victorian Inn."

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

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

An exquisite tunnel of cascading flowers.

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

This professional clown's home is an outsider art wonderland.

Dr. Strangelove-esque tours reveal the inside a bunker once reserved for Stalin himself.

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

Walk in the footsteps of the gods and straddle two tectonic plates.

Staves, storm-calling, and of course, necropants.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

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

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

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

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

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

The fantastic architectural models of a French traveler.

The famous winding walk at Chartres is surrounded in mystery and myth.

A majestic lion statue guards this Parisian botanical garden, and feeds on an unsettling item.

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.