This historic black and white monastery is one of Bulgaria's architectural jewels.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

While not Turkey's deepest underground city, this subterranean redoubt is the largest.

Natural rock formation, or biblical artifact that saved Earth's wildlife two by two?

Standing proud atop a Turkish bluff, this Ottoman palace has retained its grandeur despite being abandoned for centuries.

Climbing to the top of the cathedral's bell tower offers sweeping views of these medieval ruins.

One Portuguese poet described this cape, the westernmost point in mainland Europe, as "where the land ends and the sea begins."

In Portugal, a secluded stretch of untouched natural beauty hides at the bottom of a steep hill.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

The world's oldest bookshop still in operation.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

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

The world's largest concentrated solar power plant.

Within the Dadès Gorge, amazing vistas and towering cliff faces can be seen at each new curve and bend in the road.

One of the most spectacular canyons in the world.

God's Saharan sandbox of wrath.

A tribute to the area's namesake and King Edward VII.

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

Traditional 11th-century outdoor tannery.

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

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

Founded as a refugee camp, now a popular tourist spot.