One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

Rebuilt remains of a temple to Roman god Mithras.

An unusual round church in London with a Templar past.

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

Following the trail of an old metro line, this scenic path is haunted by a creepy spriggan statue.

This crumbling, graffiti-covered mansion sits tantalizingly within reach of the proletariat who frequent a public park.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

Indents in the pavement are all that remain from a grisly death machine in Paris.

The mummified heart of Louis XVII, the lost dauphin of the French Revolution.

A gravity-defying "devil's bridge" that has a surprising architectural feature for its stability.

The resting place of 18th century German mummies.

Mozart's skull may be held in this collection, but definitive proof continues to elude scientists.

Terrifically morbid cemetary and site of famous Paracelsus' grave.

This abandoned island off the Venetian coast has been a radical monastery, a political prison, and a secret Nazi base.

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

The plague quarantine island home to the alleged "Vampire of Venice."

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

The oldest of Venice's plague quarantine stations, designed to keep the medieval city safe from disease.

As can be expected from a centuries old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

This intricate Hindu temple is the largest of its kind outside of India itself and was constructed like a giant puzzle.

The 40-foot-tall votive candle is the largest of its kind.