A lush indoor jungle fills this bustling Madrid transportation hub.

This former charity hospital for elderly clergy houses some of Seville’s most treasured paintings.

The world's largest wooden structure.

This remarkable museum sprung from one of the most important prehistoric archaeological sites in the world.

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

The former home of a conniving 17th century politician is now a high-end hotel.

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

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

An unusual but excellent display created in the 1930s as propaganda against the Freemasons.

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

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

These "mermaids" that surround a plaza in Segovia are rather sphinx-like.

A controversial art piece that harkens back to local folklore.

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

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

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

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

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

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

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

An automaton perched above an classic clock and watch store

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

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

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