The other side is actually green.

Thousands of narrow alleyways in an ancient medieval city make up what's believed to be the world's largest car-free urban zone.

World's largest film studio, where visitors tour the decaying sets that litter the harsh desert environment.

This abandoned, turn-of-the-century astronomy hub is now the subject of more photographs than it ever took.

The world's largest wooden structure.

Moorish signal station on a stratgic rocky outcrop.

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

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

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

Rare karst landscape eroded from a flat seabed.

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

The world's most elegant power lines.

The effect of this ancient form of image projection situated atop an 11th century Moorish palace is thrilling.

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

The final resting place of the great navigator, or maybe his brother.

This small chapel is built of human bones and decorated with a golden skeleton.

Dead weights honor the dead of Portugal's fishing industry.

This star-shaped military outpost is now simply trying to protect itself from neglect.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

The corpse bride of Portugal.

A unique seaside cave where Aleister Crowley faked his own death.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

This unreal Portuguese palace looks as though it's made from a pile of different castles.