Long tunnels run under the ancient chariot racing circuit to the tower.

This enormous censer uses a pulley system installed over 400 years ago.

A towering monument in Spain has proven to be more labor-intensive than initially planned.

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

An iconic and controversial ancient Iberian funerary urn with a hauntingly penetrating gaze.

This line of 12 tower mills described in the story of Don Quixote is among the most iconic landscapes in Spain.

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

According to the Guanches, the aboriginal people of the Canary Islands, the king of evil lives inside this volcano.

This underground church is topped with a 500-foot cross that is seen by many as a beacon of fascist hubris.

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

An eerie collection of the surviving structures from a past celebration of the future.

Geological storytelling.

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

A 16th-century Andalusian palace.

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

An ancient Roman theatre restored to its former glory in the Spanish city of Cartegena.

A display of torture devices used in the Spanish Inquisition and other scourges of medieval Europe.

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.

These magnificent city walls rise from the barren sun-baked Spanish plains like something straight out of a fairytale.

A lush indoor jungle fills this bustling Madrid transportation hub.

The final resting place of the great navigator, or maybe his brother.

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.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.