A 60-room castle constructed by a horse-racing heir.

A railroad magnate's replica village has become home to a genetic seed bank for rare breeds of livestock.

This Rhode Island mansion was a stand-in for the exteriors of Collinwood in the original "Dark Shadows" series.

Birthplace of America's first documented serial killer.

One New Hampshire alleyway has become home to a public gallery of feline art.

America's oldest archaeological site or a muddled case of wishful thinking.

A mysterious stone embedded at the base of a historic Boston building.

The middle finger of modernity.

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.

Indents in the pavement are all that remain from a grisly death machine in Paris.

The oldest stone house in Paris was built by its most famous alchemist.

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

One part local history, 99 parts gruesome haunted house.

It is against the law to obstruct the view from the top of this English burial mound.

Furniture tries to escape an abandoned building in San Francisco.

A creepy steel gremlin has protected the Bay Bridge since 1989.

There is no trying to fall in love with this Star Wars fountain, you just do or do not.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

This delicate museum is devoted to the art and industry that once supported Cape Cod's oldest town.

This huge pile of volcanic boulders hides a stunning network of secret grottoes.

An alleyway plaque is all that remains of the independent Texas' envoy that forgot to pay their rent for over a century.

This South London cemetery holds the remains of more than 15,000 people.

Limestone caves with spectacular showcase chambers.