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

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

A former steam-powered mill from the 1800s is now an industrial park with a giant steel dragon slide.

Barcelona's only remaining tram system takes riders to the Tibidabo funicular.

A science fiction-inspired apartment building designed by a famous Spanish architect.

An architect transformed this abandoned cement factory into his castle-like workshop.

A surrealist labyrinth and museum of contemporary sculptures.

One of Antoni Gaudí's least-visited works, an homage to Catalan patrimony that mixes neo-Gothic with Modernista forms.

Designed by Gustave Eiffel before his famed tower.

A pastry shop specializing in Sephardic sweets serves historic recipes in Ribadavia’s Jewish quarter.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

A darkly erotic open-air statuary in Catalonia.

Religious dwelling in a Spanish volcano.

Village situated on a narrow volcanic escarpment.

A Romanesque tower appears when water levels drop.

The world's largest solar furnace uses 10,000 mirrors to concentrate the sun's rays to generate power.

The oldest operating roller coaster of its kind, the Montaña Suiza has been thrilling riders since 1928.

This huge abandoned fortress hidden inside a mountain holds a world of subterranean secrets.

A landscape decorated with enormous skull sculptures.

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

This 19th-century fountain's namesake animal isn't what you think it is.

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

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

A charming Spanish village sits atop this natural limestone overpass.