A small plaque promises cold, hard cash in exchange for work by the famous pop artist.

A real plaque marks the spot where a Faulknerian character committed fictional suicide.

Final resting place of the author who wrote the ghost story "The Turn of the Screw," and his brother, the Harvard doctor and paranormal investigator.

The final resting place of a suffragist author.

At the supposed instruction of Ben Franklin and Socrates, a Spiritualist believer intended to birth a mechanical messiah here.

A cave dug by a man directed by ghosts to find pirate treasure.

The macabre graffiti spectacle in a quarry in a Massachusetts forest reservation.

The inspiration for H.P. Lovecraft's horror stories and Batman's Arkham Asylum is now a condominium complex.

It was an experiment to prove that glacial boulders and rocks can be used in constructions and dwelling.

The site of the Andover Witch Hunts, which ended with more witch accusations and arrests than Salem.

A defunct all-girls college which may be the resting place of H.P. Lovecraft's real-life Necronomicon.

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

Former abode of notable poet, complete with literary references and stories of ghosts.

A local student's chance encounter with Keith Haring led to the creation of one of Europe's largest murals.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

Next to the Leaning Tower of Pisa is a cemetery home to ancient sarcophagi and disturbing murals.

The wreckage of a tragic plane crash is on display at this museum devoted to a famous Italian conspiracy.

An amazing collection of wax anatomical models and terratological models.

This zoological museum began as the first great curiosity cabinet.

An extraordinary collection of 18th century anatomical waxworks.

The remains of an ancient Roman city are hidden underneath Bologna's beautiful public library.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

This 1,700-pound edible sculpture is way better than your average chocolate mousse.

Maine's oldest diner also happens to win acclaim for its elevated comfort food.