A lush indoor jungle fills this bustling Madrid transportation hub.

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

A scale model of our Solar System, where physical representations of the Sun and planets have been placed along a route in the local park.

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

Built in 1925, this glass-roofed shopping arcade is known for its modernist Italian architecture.

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

This art installation at an abandoned lipstick factory has distinct anti-capitalist vibes.

This abandoned mansion has a window for every day of the year, and is a temple for ghost hunters.

The cathedral of a controversial, conservative, schismatic sect that declared the Catholic Church heretical and founded its own succession of popes.

Touching this little fossil embedded in the wall of a grand mosque-cathedral may make your wishes come true.

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

Holding the current title of "biggest chair in the world," it stands with little fanfare in Lucena, Spain.

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

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

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

The world's largest wooden structure.

Spain's largest bullring offers a unique glimpse at architecture and history.

Many miles south of Loch Ness, a similarly-named sea monster stands at the center of a roundabout.

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

The only urban monument in the world designed by the great surrealist painter Salvador Dalí.

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

Three bridges and one giant canyon make up this fantastic Spanish settlement.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

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