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

One of Jeff Koons’s largest sculptures and his first commemorative work.

A remnant of the Franco-Prussian War, lodged in the city's walls.

This Parisian café sticks almost exclusively to an ethos of reuse.

1,500 Commonwealth servicemen of World War II are buried or commemorated in this cemetery.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

This famous archeological mystery may be an ancient example of movable type.

The former home of France's controversial pop maestro is almost completely covered in ever-changing tributes and graffiti.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This surreal statue brings a famous French novel about a supernatural cad to arresting life.

Montmartre's sole surviving windmill became an iconic landmark for 19th-century painters, artists, and bohemians.

This bridge was constructed from the rubble of the infamous Bastille.

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

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.

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

With a history of slaughter, feast, and famine, remnants of the pork industry decorate this area--even its church.

Budapest's Communist-era statues, banished to the suburbs.

The ancient latrines of the Greeks, in all their public glory.

This crumbling medieval basilica once attracted pilgrims by the thousands to collect a miraculous dust that formed above the saint's tomb.

Seven early Christians were sealed into a cave where legend has it they slept unharmed for centuries.

Carvings in Turkey's Marble Road may have directed ancient Romans to a hidden brothel.

One of the largest wooden constructions in Europe was meant to be a casino, but soon became an orphanage.