These magnificent city walls rise from the barren sun-baked Spanish plains like something straight out of a fairytale.

Elevated freight railway turned wildly successful urban park.

This colorful statue welcomes visitors to a Barcelona park.

An early 20th-century bullring converted into a modern shopping center.

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 most classic buildings is well-known for its "dragon-back" design.

Hidden away in the city of Madison, Wisconsin is a nearly forgotten home that Frank Lloyd Wright built for a childhood friend.

The Cathedral of Salamanca has a number of unusual carvings but none so surprising as a modern astronaut.

An ancient Egyptian temple in the middle of Madrid, Spain.

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

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

A living art gallery painted on a canvas of Monterey pine trees.

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

Two towns are linked by an engineering marvel masquerading as a boring suspension bridge.

Giant topiary dog once played a role in a terrorist bomb plot.

This whimsical fountain pays tribute to Toronto's four-legged friends.

Edison's cast-in-place concrete houses were a failure, but way ahead of their time.

Sacred Indian temple that’s all monkey business.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

The world's second-largest sundial, made entirely out of stone.

The 953 windows undoubtedly make this the world's most beautiful screened porch.

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

A Nessie-like monster supposedly lurks in this lake.

Though its celestial ceiling is impressive, the true star is the vast collection of French books.