The prototype for all Nazi concentration camps.

Horrifically creative torture devices and shame punishments line the walls of this chilling museum.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

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

Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

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

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

One part local history, 99 parts gruesome haunted house.

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

These steps offer a breathtaking view of one of Europe's most besieged fortresses.

A book bound in the skin of an infamous criminal, along with countless other specimens.

There are plenty of wonderful panoramic vistas in Edinburgh, but not many are hidden smack in the middle of the Old Town.

This early version of the guillotine was used to execute the man responsible for its construction.

These tiny effigies are believed to represent victims of Edinburgh’s notorious Anatomy Murders.

The tomb of one of Scotland's bloody historic villains is a magnet for bumbling desecrators.

Protecting the dead from opportunistic body snatchers.

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

This small museum in a 17th-century building honors three iconic Scottish writers.

Touching this 18th-century Scottish philosopher’s toe allegedly conjures good fortune.

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

Edinburgh's oldest statue hides within a parking lot behind the city's iconic cathedral.

The colorful stairs are made with marble from the world's major quarries.

This 17th-century street hidden beneath Edinburgh was once a breeding ground for the black death.

This charming old building's loose connection with the Scottish Reformer is what saved it from demolition after it split apart.