Bad farming practices caused this unnatural natural wonder.

Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

This curious, round temple is the oldest still-standing marble building in Rome.

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

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

A massive marble foot is tucked away in a small alley near the Pantheon.

An ancient Roman temple first dedicated to an emperor's wife is now a church.

The whimsical construction on the roof has given rise to many a Montgomery myth about its contents.

Local myth claims this is a Sears catalogue home with its windows installed upside-down.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

The walls and streets of the ancient city are peppered with penises.

Erotic art covers the walls of the largest ancient pleasure palace.

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

This striking sculpture of Icarus honors Greece's fallen flyers.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

An art deco ice cream shop covered in vintage tiles.

A sinuous monument to the first person who was struck by a meteorite.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

Paris' linguistic guide to the international language of, yes, love.

The video game-themed street art first popped up in the French city.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

This demon atop the Notre-Dame de Paris looks utterly bored.