The "plyscraper" is the world's tallest building made predominantly out of wood.

These gigantic skeletons tower over visitors and provide insight into the creatures that once ruled over Ireland.

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

An abandoned quarrying village turned commune is now a hub for learning the Welsh language.

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

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

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

Elaborate tile work in this railway station tells the story of Portugal.

God's Saharan sandbox of wrath.

A mud brick kasbah with a history of lavishness and traitorship.

A fortified city, home to a remaining population of five families

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.

The oldest known university in the world is in Fez, Morocco.

Traditional 11th-century outdoor tannery.

The courtyard of this small Marinid madrasa is a dazzling example of intricate Islamic architecture.

The designated Jewish quarter in Fez dates back to the 15th century.

A five-square-mile slice of Spain on the Mediterranean coast of North Africa.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.

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

The world's largest wooden structure.

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

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