Blending modern art with Baroque architecture, this wondrous mosaic grotto serves as the late artist's final creation.

A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

Life-sized bronze statues of fictional puppet characters.

The bones of the Biblical Magi traveled to Constantinople and Milan before landing in their current home inside an elaborate golden reliquary in the Cologne Cathedral.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

The tallest mountain in mainland Netherlands isn't actually very tall.

A beautiful maze marks where three countries meet.

The ruins of this Dutch castle sit atop a labyrinth of once-secret tunnels and passageways, dating back over 900 years.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

This beautifully designed star-shaped fort was the premier defense system of the late 1500s.

A spitting ode to a German serial killer.

Eight naturally mummified bodies in glass coffins are housed in an underground crypt.

Böttcherstraße's bells, extolling Nordic virtues and the great conquerors of the world.

A stunning gilt bronze relief denounced by Hitler as "degenerate art"—even though it was dedicated to the Nazi leader.

One of the oldest wine cellars in Germany is now a restaurant beneath Bremen's town hall.

An Elvis superfan built Denmark's own version of Graceland.

It appears as if a man is standing behind this giant airport clock, painting the hands in real time.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

A house built from trash known as the poor man's Hearst Castle.

An alley covered with 20 years of bubble gum.

A chain of bells connect the California Missions and honor the legend of the "King’s Highway."

One of the last surviving buildings of a once large and thriving Chinatown.

A massive volcanic plug is now a protected area that hosts a number of bird species.