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

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

The oldest stone house in Paris was built by its most famous alchemist.

A mechanized clock where a man fights off a dragon, crab, and rooster.

For more than a century, revolutionary graffiti has marked the wall of a Parisian church.

This Paris art space celebrates the creativity and ingenuity that springs from abject poverty, especially in Africa.

This stone angel is one of the biggest caryatids in all of Paris.

France's national museum of scientific and industrial instruments.

The Argonaute submarine was the French navy's pride and joy in the 1950's.

A modern-day Lascaux cave underneath Paris.

Notorious artist squat renovated into legal studios.

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

A lone cannonball remains lodged in the walls of the Hotel de Sens as a sober reminder of a revolution.

A museum dedicated to one of Paris’s most famous residents, tucked into a corner of one of the city’s most famous squares.

Indents in the pavement are all that remain from a grisly death machine in Paris.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

This banal Parisian entranceway is not what it seems.

This statue has a painful history, but activists have since recontextualized it as a way to educate visitors about the dangers posed by fascist regimes.

A plaque on the side of a building is a small tribute to the woman who invented an iconic Berlin fast food.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

Dine at a legendary after-hours joint frequented by David Bowie and Iggy Pop.

Some believe that the artist behind this whimsical statue inserted his own likeness as a way to discreetly flip the bird.

This Nazi-built amphitheater was constructed on a sacred mountain site used by various German cults.

Lines on the pillar of Heidelberg's Karl-Theodor Bridge record the dramatic heights of past floods.