The facade of this 16th-century building is decorated with carvings of 300 seashells.

This Roman arena once played host to bloody gladiatorial battles.

The blowhole bursts spectacularly right next to the buildings in a medieval seaside town.

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

The ruins of an ancient stadium that hosted gripping chariot and horse races.

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.

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

The Cathedral of Salamanca has a number of unusual carvings but none so surprising as a modern astronaut.

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

Rare karst landscape eroded from a flat seabed.

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

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

Catalonia Tradition: Beating the hollow Christmas log until it defecates in your fireplace.

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.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

A pair of gigantic baby heads greet passengers at Atocha Station.

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

Commonly acknowledged as the only public monument to the Devil himself.

A lush indoor jungle fills this bustling Madrid transportation hub.

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

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.