Tiny castle in the middle of the Rhine made you pay to pass.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Unsurprisingly, Holland is home to one of the most magnificent flower gardens in the world.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

The "feral child" who appeared in Bavaria in the 19th century remains as much a mystery as his unsolved murder.

One of downtown Berlin's last reminders of its Communist past.

A striking 12th-century-style castle built on the edge of a cliff.

Where once there was a train station bathroom, there is now this German burger joint.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The most visited, and possibly most controversial, museum in Germany.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

A church of bones, decorated with 40,000 human skeletons.

This historic stone bridge has an entire neighborhood clinging to its sides.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Soaring over 6,000 feet in the Bavarian Alps, this beer garden was once Hitler's 50th birthday present.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

Ugly 18th-century dwarf statues living in a perfectly landscaped Austrian garden.

The yawning maw of this pagan visage is said to bite off the hands of liars.

A small but immensely extravagant palace built by the "Night King."