This colorful statue welcomes visitors to a Barcelona park.

This influential Renaissance-era library was once the haunt of kings and monks.

The Roman city was the birthplace of various emperors and is home to one of the empire's most impressive architectural feats.

This home designed for chocolate magnate Antoni Amatller is an exquisite treasure-box of Catalan Modernism.

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

A huge cathedral single-handedly constructed by one eccentric monk.

Two towns are linked by an engineering marvel masquerading as a boring suspension bridge.

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

This stunning iron gate designed by Modernist architect Antoni Gaudí is filled with mythic symbolism.

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

A contemporary art installation housed within a Gothic cathedral.

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

Remarkably intact Roman stone fortifications have encircled this Spanish city for centuries.

Barcelona's only remaining tram system takes riders to the Tibidabo funicular.

Thanks to an acoustic anomaly, this unassuming stone bench has heard one hundred years of secrets.

The remains of the second-oldest zoo in Europe can be seen within these library gardens.

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

An early 20th-century bullring converted into a modern shopping center.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

A cemetery in Barcelona's Poblenou district is home to this touching funerary statue, which depicts death in the form of a winged skeleton.

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

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

This religious complex carved into a cliff is steeped in legends of miraculous stags and the Holy Grail.

Among the oldest structures in Madrid, these Moorish walls once guarded the medieval city of Mayrit.