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

A small town Romanian cemetery filled with darkly humorous gravestones.

This uber-quaint Polish village is known for its habit of painting elaborate floral motifs on just about everything.

An underground city of salt.

Communism's topsy-turvy effect on Poland has been brought to life in this wacky tourist trap.

Lithuania's outdoor sculpture trail of wooden folk art.

An old hill fort covered in over 100,000 crosses is a symbol of Lithuanian nationalism and beliefs.

This stunning, out-of-the-way Croatian monument commemorates a community's uprising against occupying fascist forces.

Two stunning 17th-century libraries and a cabinet of curiosities.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

A musical instrument played by the sea.

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

An eerie, derelict amusement park in Berlin.

A Museum of Psychiatry in a still-operating mental institution.

Just your average Marie Antoinette–themed speakeasy in an abandoned 19th-century subway tunnel.

A way to take your secrets to someone else's grave.

A beautiful collection of architectural ornaments rescued from demolished New York City buildings.

A Victorian cemetery in the heart of Brooklyn remains a popular mecca of morbid curiosity.

The one-stop shop for all of your superhero (or evil arch-nemesis) needs.

Three floors of musical instruments coming from all corners of the world and hundreds of years of musical history.

A 30-acre garden inspired by the principles of modern physics.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

Northern Ireland's Brobdingnagian stepping stones.