World's largest collection of serial killer artwork and other macabre exhibits.

A terrific purveyor of natural history objects and curios.

Home to items never before seen by the public.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

France's most famous cemetery, with some of its most curious tombs.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Legend says this mysterious stone head belongs to a woman who was petrified by an alchemist.

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

Two plaques commemorate the site of Shakespeare's first theatre.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Overlooking the burial ground is a tower designed to prevent thieves from snatching the recently deceased.

Remnants of the 16th-century defensive wall still stand unassumingly within Edinburgh.

This otherwise ordinary close on the Royal Mile constituted the end of the world for Edinburgh’s poorest residents.

The most loyal of little dogs, or a Victorian era publicity stunt?

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

The final resting place of soldiers' loyal canine companions.

A sweet symbol marks the place where torturous executions were once carried out.