This Luxembourg cave is covered in cryptic looking marks left by mining activity.

This tri-part waterfall is a little bit of fairytale beauty in the heart of Luxembourg's Little Switzerland.

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

This small chapel built into rock is the oldest place of worship in Luxembourg.

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

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

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

Dedicated to the American general whose reply to a German demand for surrender was simply "Nuts!"

This large open-air museum showcases the ordinary lives of the people of the Netherlands and pre-industrial crafts and practices.

Rotterdammers' dirty minds gave this Santa a dirty nickname and cursed it to a life of wandering.

The oldest statue in the Netherlands has survived relocation, bombardment, and burial.

Old ships and machinery fill a historic harbor in the city that's home to Europe's largest port.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

A bridge that has seen many reiterations over its lifetime.

The cutest way to stay safe in traffic.

Museum preserving torture methods from the past.

Europe's official "zero-level," the equator of elevation.

This basement museum explores the art and artistry of fascism.

Seven mini rowhouses fill the gap between 54 and 70 Westerstraat.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

Hop aboard a charming bog train to explore this rare open-air museum of peat.

This giant radio telescope would be a rusting ruin if it hadn't become such a beloved relic.

A radio telescope for listening to the stars, based in one of the cloudiest countries in the world.

This small town in the Netherlands has no roads but instead, miles of canals and over 100 bridges.