One of several skulls claiming to belong to the beheaded St. John the Baptist is on display at this Roman church.

Inside this McDonald's you can dine on your Big Mac and fries next to a 2,500-year-old Roman wall.

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

The yawning maw of this pagan visage is said to bite off the hands of liars.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

An early masterpiece of Le Corbusier, a famed Modernist architect, hiding in plain sight.

An opulent monument built for a duke who donated his entire fortune to the city of Geneva.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

Florentine Renaissance style building in Switzerland, home to the world's largest taxidermy Great White Shark.

The university library shaped like a giant piece of Swiss cheese.

A constellation of golden cobblestones shows the names of local children born under a full moon.

Artworks by loners, prisoners and the criminally insane.

A building that looks like a giant hedgehog, in the middle of East London.

England's “third-oldest college” has not graduated a single student in over 400 years.

The world’s second-largest flood defense barrier has protected London for decades.

For more than half a century, an enormous feline has watched over this London neighborhood.

After mysteriously refusing to surrender at the end of World War II this sunken submarine was only salvaged in a search for Nazi gold.

This abandoned concrete building was once hailed as an innovative architectural marvel, originally built to store sugar.

A volcanic crater that visitors can look inside.

A moai decorated with the depiction of a European ship.

This once-controversial and slightly confusing statue of Achilles was built out of captured cannons.