Mine shafts and hard pastries await visitors at this massive mountain of salt.

An eccentric collection of antique items shares space with a prop-quality witchcraft museum.

Moorish signal station on a stratgic rocky outcrop.

This small museum tucked within a subway station holds pieces from Madrid's past.

Abandoned Nazi train station turned underground astroparticle laboratory.

An early 20th-century bullring converted into a modern shopping center.

Rare karst landscape eroded from a flat seabed.

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

This enchanting natural park is a magical example of a temperate rainforest in Europe.

Volcanic rocks ground down into sand make this Spanish beach as black as night.

An open-air "garden" of mural art that changes weekly.

Earth's rocky history has rarely glittered so brightly as it does in this Spanish museum.

Mysterious Spanish catacombs of unknown origins.

The former 1920s mansion of a prominent Catalan developer was used as the Soviet Embassy during the Spanish Civil War, and there is still a bunker below the garden.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

Of course Salvador Dalí lived in a castle...

Among the oldest structures in Madrid, these Moorish walls once guarded the medieval city of Mayrit.

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

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

The abandoned ruins of a beautiful medieval castle just outside Barcelona.

Its appearance in "Game of Thrones" may spur on the long-awaited restoration of this medieval shipyard.

A Franco-era dam flooded (almost) everyone out of this centuries-old Aragonese town.

This lucky bronze frog was gifted to Madrid by a casino.

A once-secret library of Freemason history in Catalonia.