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 former steam-powered mill from the 1800s is now an industrial park with a giant steel dragon slide.

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.

One of Catholicism's four major basilicas has a series of papal portraits that are said to predict the end of the world.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

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

Single runway interrupted by a busy road that cuts across its middle.

Rare karst landscape eroded from a flat seabed.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

This hotel was once home to a steamliner company and became the final rest stop for Europeans heading to the New World.

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.

The 20-mile causeway that separates the Netherlands from the sea.

Birthplace of the "Cat in the Cradle" and a cluster of iconic, original windmills that let the Dutch tame the seas.

A little sculpture with a large wardrobe.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

Climb inside an iron crystal magnified 165 billion times its normal size.

After the construction of a nearby cathedral obstructed the view, the oldest belfry in Belgium was more than doubled in height.

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

A Christian retreat founded to welcome refugees fleeing from the Nazis during World War II.

A 200-year-old tavern challenges guests to finish a glass of wine while hanging from a ceiling beam.