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

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

A lush indoor jungle fills this bustling Madrid transportation hub.

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

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

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

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

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

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

This cemetery features modernist statues as strange as its name.

A beautiful but toxic fountain of mercury.

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

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

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.

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

Thanks to a clever legal loophole, this mountainside wine shop sells a hybrid cuvée that's been outlawed for nearly a century.

It's a 1/20th height replica of the Eiffel Tower at 16 meters tall in the quaint village of Soing-Cubry-Chartenay.

This feat of diesel-powered engineering enabled boats to bypass a series of five locks.

The largest Commonwealth memorial to the missing and dead of the Battle of the Somme.

A picturesque vertical garden provides respite from the bustling streets of Bordeaux.

This modern district offers a stark contrast to Bordeaux's terrace-lined squares and waterfront façades.

Hidden away in the heart of the village is the curated plant world of contemporary artist Max Sauze.

A World War I German experimental concrete plant, hidden deep in a French forest.

The Musée Albert-Kahn is a departmental museum in Boulogne-Billancourt, near Paris, including four hectares of gardens, joining landscape scenes of various national traditions.