This beautiful spit of land was once the summer playground of the king of Spain.

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

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

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

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

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

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

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

Cliffside houses provide a spectacular view from their perch above the valley.

This church looks more like a spaceship than a house of worship.

This 47-story "M" needed 20 years to be completed

This massive fiberglass Gulliver turns every visitor into a Lilliputian.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

A site where “the ravages of the war are more striking…than any other place in contemporary Spain.”

This ancient theater was once the home of fierce gladiatorial battles.

Historic medieval fortified city in southwest France.

Long tunnels run under the ancient chariot racing circuit to the tower.

The ruins of a bombed medieval village memorialize the destruction of the Spanish Civil War.

This Roman arena once played host to bloody gladiatorial battles.

Stunning Roman aqueduct used for 1900 years and still standing.

The world's largest solar furnace uses 10,000 mirrors to concentrate the sun's rays to generate power.

Wonderland replication in progress by one persistent man.

Village situated on a narrow volcanic escarpment.

A darkly erotic open-air statuary in Catalonia.