King Carlos IV laid the first stone during construction of this chapel.

Once the grandest synagogue in medieval Spain, it now stands as a memorial of the 15th-century Jewish exile.

The most elaborate of 12 medieval arched doorways to the old city of Burgos.

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

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

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

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

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

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

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

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

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

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

The world's largest wooden structure.

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

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

A lush indoor jungle fills this bustling Madrid transportation hub.

An ancient Egyptian temple in the middle of Madrid, Spain.

Mountain where Jesus was first tempted by the Devil.

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

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

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.