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

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

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

This home designed for chocolate magnate Antoni Amatller is an exquisite treasure-box of Catalan Modernism.

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

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.

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

This colorful statue welcomes visitors to a Barcelona park.

Archduke Ferdinand II's collection of rare objects is considered one of the oldest museums in the world.

A trough of 700 strange bronze faces runs through a narrow alley in Ljubljana's old town.

A whimsical bridge adorned with decorative dragons.

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

Op-art architecture designed for happiness.

A fake medieval village in the middle of Turin.

One of the oldest and most significant collections of Ancient Egyptian archeology outside of Egypt.

When this funny little building went up in the 19th century, most people thought it would simply fall over.

The intricate geometry inside this Baroque-style dome was designed to create "terror of the human soul."

One of the world’s smallest bars, just 13 square feet, is brimming with speakeasy flair.

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

The secret medieval communication system will whisk your words above the noise of the crowd.

Artistic tombs, monuments, and a beautiful "Hall of Fame" lurk inside this cemetery.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

Old batteries and frog skeletons reside in this lakeside monument to Alessandro Volta.

This sculpture of a rhinoceros suspended above a city square is meant to evoke the weight of the human condition.