This impressive Gothic church dates back to 1244 and stands on the site of one of the first churches in Scotland.

One of London’s rare Tudor-era buildings is a fate-defying gatehouse for a church.

A mysterious suspended hand greets unsuspecting visitors at the Tower of London.

Look up from the busy streets to discover how time is kept!

A jumble of concrete on the corner of one of London’s terraced buildings is actually a work of art.

This mysterious pyramid is said to be part of a complex web of occult and Freemason symbols.

Several colorful mosaic panels depict the life and creative genius of the Master of Suspense.

Visit the grave of a famous feminist author and the mother of Mary Shelley.

These stained-glass windows are all that remains of a building that was the target of one of the biggest explosions in London after World War II.

There's more to this drinking establishment than meets the eye.

An ancient relic in Edinburgh that is around 4,000 years old.

One of the city's oldest pubs displays a skull said to belong to the country's last witch burned at the stake.

Twenty carved heads in Glasgow take a comical, modern twist to the medieval apotropaic, avenger of evil.

The beloved bard's garb is proudly displayed within a Freemason's hall.

In memory of the assassinated, now-canonized Salvadoran archbishop who is the namesake of nearby Romero Place.

A monument honoring 81 residents of this Scottish town who were executed for witchcraft in the 16th century.

The ruins of this magnificent Scottish castle blend both Gothic and Renaissance architectural styles.

This unusual 15th-century house of worship once catered to those who sought its healing properties.

An ancient Roman altar named after Robert the Bruce.

The remains of a 70-year-old military aircraft crash landing still sit on this Scottish hillside.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

Northern Ireland's church-turned-skate park.

This hidden museum examines the complex history of the country's law enforcement.

A small plaque highlights the damage caused by German air raids during World War II.