These 90-year-old murals of local kings, Vikings, and outlaws hide in plain sight in a beautifully baroque shopping arcade.

The oldest of the three remaining bridges in England with buildings on top of them.

Exquisite carvings of leaves, Green Men, and the occasional dragon adorn a medieval chapter house.

Legend says this demonic carving inside a medieval cathedral was one of Satan's minions.

The oldest operating Mississippi River–style steamboat still navigates the Ohio River.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

Taste the white whiskey that the United States' first president once distilled and enjoyed.

Left by the Devil, an ancient quarry or just plain old erosion, this enigmatic rock pillar rises 28 feet from the hillside.

An unexpectedly extraterrestrial room in a former Victorian resort club.

A curious urban windmill once owned by a renowned British mathematical physicist.

The Birthplace of the Englishman who founded the A.C. Milan football club.

London's smallest police station is barely the size of a phone booth.

Never actually a tree at all, this spot was the site of London's public hangings for nearly 600 years.

A network of bells in the pubs and restaurants around Westminster alerts politicians when it's time to cast their votes.

The Midwestern United States' tribute to Michelangelo is a foam statue sprayed with gaudy gold paint.

This mysterious hilltop collection of Druid carvings isn't quite what it seems.

Twice a day this ancient path disappears with the tides, leaving the Holy Island of Lindisfarne out to sea.

A pair of large white marble lions guard this stretch of the Mojave Desert, and it is utterly mysterious how they got there.

One of the largest free-standing structures ever built, this dirigible hangar is now simply a giant skeleton.

These barriers stand as stark reminders of Northern Ireland's troubled past.

The tower was originally used as a chimney for the waste incinerator of St. John's Precinct and Market.

In the ruins of Glastonbury Abbey lies the alleged resting place of the legendary king.

The undercroft is a spectacular example of medieval Cistercian architecture.

A 13th-century inn where the ill-fated King Charles I spent his last night of freedom.