This funky former tobacco factory is one of the most striking examples of Madrid's cultural diversity.

This magical space partly designed by Antoni Gaudi is one of the best examples of romantic gardening in the Mediterranean.

"Alleys of Stone" form natural mazes in Spanish natural park.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

This quaint Spanish village agreed to be painted blue as a marketing stunt but found that they preferred it that way.

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

Cursed swimming pool left abandoned is now a favorite of filmmakers and ghost hunters.

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

Moorish signal station on a stratgic rocky outcrop.

Abandoned Nazi train station turned underground astroparticle laboratory.

A Spanish town built into the cliffs.

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

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

A gravity-defying "devil's bridge" that has a surprising architectural feature for its stability.

A landscape decorated with enormous skull sculptures.

At the foot of a waterfall lies a peaceful swimming lagoon and evidence of over 60,000 years of human habitation.

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

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

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.

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

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

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.