Of the many chalices in the running for the Holy Grail, this one in Valencia Cathedral sure looks the part.

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.

A 16th-century Andalusian palace.

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

Mysterious Spanish catacombs of unknown origins.

The oldest giants in Catalonia are now displayed in a 14th-century Gothic church.

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

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

Of course Salvador Dalí lived in a castle...

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

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

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

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

The chefs at El Diablo use heat generated by an active volcano to cook the food.

A charming Spanish village sits atop this natural limestone overpass.

In the fictional world of Kcymaerxthaere, celestial wonders marked a portal to a powerful route of travel at this site in Madrid, Spain.

One of the world's oldest universities houses an incredible collection of anatomical models, mummified body parts, and human bones.

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

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

A once-secret library of Freemason history in Catalonia.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

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

The earliest known map to show America, discovered by accident at a Paris bookshop.

Possibly the oldest church in Barcelona, this basilica has its pagan and Christian mythologies all mixed up.