Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

A miniature city, once ruled by the Queen of the Netherlands.

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

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

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

A floating cat sanctuary on an Amsterdam canal.

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

A merchant court dedicated to the fictitious King Arthur is heavily adorned with bizarre Renaissance art.

This fairytale inspired, warped building houses restaurants, shops, and a radio station.

This man-made mound monument was built out of soil from all across the Polish empire.

Naturally formed rock city in Poland.

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

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

The world's largest wooden structure.

A Spanish town built into the cliffs.

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

This cemetery features modernist statues as strange as its name.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

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.

This exclusive resort has completely covered a tiny Balkan island in a 5-star warren of guest rooms.

A tiny church on a man-made island in the Adriatic.

A curious little museum dedicated to the furry feline in the cat haven that is Old Town Kotor.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.