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

Cliffside houses provide a spectacular view from their perch above the valley.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

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

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

One of the largest ossuaries in Spain is packed from floor to ceiling with bones.

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

This former charity hospital for elderly clergy houses some of Seville’s most treasured paintings.

An isolated village literally built into the crevices and rock formations of a mountain.

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

Stunning Roman aqueduct used for 1900 years and still standing.

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

A charming Spanish village sits atop this natural limestone overpass.

This massive fiberglass Gulliver turns every visitor into a Lilliputian.

This awesome Spanish castle is so fantastical it was actually used on Game of Thrones.

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

A completely underwater art museum sends a stark message about humans' impact on the environment.

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

Considered the birthplace of the Copper Age and Bronze Age, the river is tinted red from 5,000 years of mining.

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

Occupied for six centuries by Franciscan Order nuns, this monastery is an amazing ode to Catalán Gothic architecture.

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

A once grand hotel now sits eerily abandoned in the Catalan countryside outside Barcelona.