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

An enchanting monastery in the Spanish countryside appears lifted from a fantasy tale.

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.

Bacteria and algae give the salty water its bubblegum hue.

Wonderland replication in progress by one persistent man.

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

Bask in the 19th century grandeur of an eccentric Freemason millionaire's private gardens.

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

A museum dedicated to the Spanish occult in a town that was terrorized by the Inquisition.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

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

An unusual stroll through gentlemen's erotica demonstrates that pornography is timeless.

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.

A beautiful but toxic fountain of mercury.

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

This semi-secret storybook hedge maze is also the oldest garden in the city.

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.

The first park built over a freeway is a brutalist masterwork.

This Seattle joint serves food inside an old train car once used by FDR.

This grand old 80-foot sequoia towers above the buildings in the city’s retail center.

This historic hub for labor unions has survived the city's changing landscape.