Hidden in the garden of physicist Erwin Schrödinger's house is a life-size figure of a cat from his famous thought experiment.

The official motto of Luxembourg reminds passersby of the Luxembourgish commitment to their national identity and sovereignty.

Statues of a fire-breather, a clown, and a whole performing troupe celebrate Luxembourg's creative side.

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

This magenta statue commemorates the legendary marriage between a mermaid and the city's founder.

A scene from one of Hungary's most famous novels.

A triumphant marble and bronze fountain depicting a 15th-century Hungarian king and his hunting party.

The metal leaves on this tree are engraved with the names of Holocaust victims.

From cartoon characters to tiny tanks, a guerilla sculptor's little bronze statues are hidden throughout the city of Budapest.

Often mistaken as a medieval Gothic monument, this unique cornerstone only dates back to the 1980s.

This renovated Art Nouveau bathroom from 1905 is worth the price of admission.

This Algerian sweet shop serves confections in an eye-popping array of hues.

A giant silver apple a day keeps the perils of capitalism away.

The tombstone of an unfortunate explorer who disappeared in the Paris Catacombs.

A melancholy jester sits on the grave of a famous 20th-century ballet dancer and choreographer.

The remains of the medieval wall that once surrounded Paris with ties to the construction of the Louvre.

For more than a century, Parisians have come for affordable dishes in a grand converted train station.

A poem by Arthur Rimbaud is inscribed on the wall of a street that, while it is only one block long, plays a key role in multiple novels.

During the summer months, giant teddy bears take over Paris near Les Gobelins metro station.

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

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

This 14th century wine cellar is home to the oldest barrel-stored wine in the world.

Visitors dating back to the 1600s carved their marks in the stones of the iconic tower.

A pink sandstone column once used in ancient times to measure one's belly after a night of debauchery.