This 400-year-old tree is actually an immigrant from North America.

A surrealist timepiece by the artist of melting clocks.

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

Healing waters from a holy well, previously used by locals for doing laundry.

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

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

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

Luxembourg's most popular statue since 1923 has been missing for... 26 years!

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

A 16th-century fountain marks the site of a lost medieval cemetery once filled with mass graves.

This recessed garden protects thousands of mountain plants by creating its own microclimates.

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

Known as the "Dodo Manège," this carousel features a herd of animals that have disappeared—or may be gone soon.

A haunting collection of the vanished and disappearing natural world.

A tribute shrine where the Space Invasion street art movement started.

An immersive projection art installation uses sound, scale, and light to take visitors inside classic works of art.

Designed as a reminder of one of the darkest moments in Austrian history.

A mechanical clock built in 1914, with a rotation of 12 historical figures on its face.

A non-stop elevator ride in Vienna's city hall.

The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.

Visiting this café is like visiting the Austrian grandma you wish you had.

Along the edge of this fountain are 365 smaller fountains that represent the days of the year.