One of Edinburgh's oldest pubs hides a 19th-century skittles alley in the back.

This cannonball embedded in the side of an Edinburgh house once served a surprisingly pedestrian purpose.

The fountain marks the area where hundreds of accused witches were burned at the stake.

A quartet of brightly colored mythical beasts stand sentry at this gateway.

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

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

The Scottish Reformation leader's grave was paved over and is now a parking lot.

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

Dedicated to the Father of the British Fire Service.

The remains of a grand castle that may have inspired Bram Stoker's Dracula.

This site contains overlapping ancient graveyards that existed about 1,000 years apart.

The oldest church in Inverness witnessed the brutal executions of many Scottish soldiers.

Where the sleeping monsters of Scotland's oil industry are left to rust.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

The medieval woodcut-style artwork chronicles life in medieval London.

This ancient Egyptian obelisk still bears the wounds of World War I.

These ornate arches show how the course of the River Thames has changed.

Originally built for London’s cab drivers, this bright green hut now serves anyone a hot drink or meal.

Children's hospital in London that operates on royalties received from Peter Pan, which J.M. Barrie signed over in 1929.

The "beautiful" equation predicting the movement of all electromagnetic particles is engraved in front of Newton's tomb.

An architectural oddity hides in plain sight on this iconic London bridge.

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

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

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