Built to power trains, the engines in this building provided the entire city of Madrid with electricity during the Spanish Civil War.

A subterranean relic of the Spanish Civil War hides below this picturesque park.

The remains of the second-oldest zoo in Europe can be seen within these library gardens.

The haunting cadaver tomb of a famous French poet, playwright, and filmmaker.

This 15th century pharmacy displays a beautiful collection of ancient medicine jars.

Every half hour, the flow of this unusual spring cycles between a rush of water and barely a trickle.

Half a century after it was abandoned, this ghost town is coming back to life.

Small French town or alien garage?

A precariously balanced goose-shaped boulder with a dark legend.

A well-preserved medieval village nested on a rocky outcrop and surrounded by a network of cliffs, natural bridges and canyons.

A beautiful little museum hidden away in the heart of Barcelona holds a treasure trove of Ancient Egyptian artifacts

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

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

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

This stunning iron gate designed by Modernist architect Antoni Gaudí is filled with mythic symbolism.

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

This medieval chapel is now a shrine to the region's favorite sport.

The blowhole bursts spectacularly right next to the buildings in a medieval seaside town.

This religious complex carved into a cliff is steeped in legends of miraculous stags and the Holy Grail.

Abandoned Nazi train station turned underground astroparticle laboratory.

This Canadian hunting lodge is a long way from home.

This memorial, built by fascist dictator General Franco in 1960, has been repurposed by the people of Catalonia.

This futuristic observatory at the top of the Pyrénées offers unrivaled views.

Historic medieval fortified city in southwest France.