An architect transformed this abandoned cement factory into his castle-like workshop.

Rumors of the occult haunt this upscale 1920s hotel.

This legendary "evil" doll has been haunting the citizens of Key West for over 100 years.

One of the most well-preserved castles in Italy also contains a rare medieval example of a port fortification.

This library dates back to the late 17th century and was one of the first public lending libraries in England.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

This monastery built into a cliff hides a perfectly preserved hermit in a glass coffin.

A castle perched precariously over the Crimean Sea.

This precariously perched fortress was once ruled by a crow-worshipping baron.

A historic observatory precariously perched at the "Top of Europe."

An abandoned stretch of elevated road in the middle of the Brazilian jungle.

Named for the biblical warrior, the largest castle in Israel actually dates to the Middle Ages.

Stroll through a wonderland of stupendous moss-covered trees.

The silent film master's legacy commemorated in all the right and wrong places.

This "cursed house" features secret rooms, hidden vaults, and dark escape tunnels.

An engineering error ensured this cavernous 350-foot-long subterranean thoroughfare was never used as intended.

Known as the Royal Palace of the Euganean Hills, this often overlooked castle has been home for multiple noble families over the centuries.

The ominously named cave is home to some remarkable ancient art.

The largest portal tomb in Europe has a capstone weighing around 150 tons.

A historic holy well hidden near a charming English park.

An alternate history park where the Union Army loses the war... to dinosaurs.

Hidden on two floors of downtown building, the library has an incredible deal on rent.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

Unexplained bald patches in the landscape grow and recede over time, as though they are somehow alive.