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

The world's largest wooden structure.

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

The ruins of a 2,000-year-old Roman fishing village perched on one of the best beaches in Spain.

Single runway interrupted by a busy road that cuts across its middle.

A New York–based physician returned home to Spain to build his own elaborate monument to Christopher Columbus.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

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

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

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

In this 400-year-old hotel in Madrid, you'll find a comb in every room, an old clock, and maybe a ghost.

This unassuming bookstore in the heart of Madrid is one of the oldest in Spain.

This small museum tucked within a subway station holds pieces from Madrid's past.

A whimsical brother of the nearby Fallen Angel statue takes the falling part quite literally.

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

This historic fountain is a favorite neighborhood meeting point.

This funky former tobacco factory is one of the most striking examples of Madrid's cultural diversity.

A lush indoor jungle fills this bustling Madrid transportation hub.

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

Built to power trains, the engines in this building provided the entire city of Madrid with electricity during the Spanish Civil War.

Built to celebrate the glory of a new queen, this forgotten monument has moved around Madrid three times, reflecting 200 years of political whims and city redevelopment.

This uniquely shaped 17th-century structure comes alive in early September.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

Artistic tombs, monuments, and a beautiful "Hall of Fame" lurk inside this cemetery.