This historic Amsterdam bar used to accept sailor's monkeys as payment.

This bird-loving brewery is situated in an old municipal bathhouse, nestled beside a 300-year-old windmill.

Amsterdam's Red Light District leaves little to the imagination.

The former home of a mad diplomat is said to still be marked in bloody, arcane scrawls.

Tucked in the back of this amazing antique store is an important piece of medical history.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

A crumbling hospital from the 1850s on Roosevelt Island.

World's first "penitentiary," meant to be humane, drove men insane.

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

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

This historic Rhode Island mini-cemetery features a number of headstones run through with mysterious holes.

This 3,500 pound obelisk was constructed with more than 1,000 reclaimed guns.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

Last residence of H.P. Lovecraft featured in his story "The Haunter of the Dark."

"Try not to knock anything over!"

"the sweltering inhabitants of Charleston and New Orleans, of Madras and Bombay and Calcutta, drink at my well . . . The pure Walden water is mingled with the sacred water of the Ganges."

This small section of the Sleepy Hollow Cemetery is rotten with famous authors' graves.

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.

Enjoy an overnight at an old haunted B&B site of the Borden family murders.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

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

The oldest public library in Ireland.