The ruins of an ancient Mayan city, beautifully preserved and only accessible by boat.

Located in the house where Gustave Flaubert was born, this odd museum has more to do with medical grotesquery than the Western novel.

This small museum in a former church crypt contains artifacts of the Elephant Man, Jack the Ripper and Florence Nightingale.

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

Home to 10,000 medical specimens including the remains of Rudolf Virchow's extensive collection of pathological specimens.

This beautifully designed star-shaped fort was the premier defense system of the late 1500s.

This house's itty bitty size means no humans allowed.

Europe's largest natural bridge has a 19th century royal chateau built into its side.

The "world's smallest volcano" has been used to store meals and dispose of dead bodies.

A mysterious castle built as a monument to lost love.

Polish luminaries and masterful folk art find sanctuary in this unique cemetery.

Too much gossip or just missing curfew could land you in here for a couple of days.

Since 1874, this macabre collection has developed into a museum devoted to Scotland Yard's mementos of dastardly deeds.

A secretive collection featuring objects that were designed specifically for U.S. intelligence operations.

A treasure trove of pathological, forensic, parasitological, and anatomical specimens.

Dramatic sea stacks adorn the coast of this small village on the Adriatic coast.

Hundreds of mossy stones engraved with bits of philosophy, literature and random musings.

Remains of a historic fountain that was mysteriously lost in the demolition of a D.C. traffic circle.