The only castle in North America to ever house European sovereigns.

Once home to an aristocratic family and a workers' organization, this intricately tiled building now houses a chain restaurant.

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

Giant topiary dog once played a role in a terrorist bomb plot.

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

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

Spain's stunning solar energy plant.

A Spanish artist builds his own castle.

A fantastic Christmas tradition where defecation meets the manger.

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

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

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

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.

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

Stunning Roman aqueduct used for 1900 years and still standing.

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

Village situated on a narrow volcanic escarpment.

A Spanish town built into the cliffs.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

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

A lush indoor jungle fills this bustling Madrid transportation hub.

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

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.