One of the largest Roman settlements in Portugal.

Europe's largest collection of matchbox designs is a fascinating exploration of the cultural history of the world.

Mysterious face-like images that appeared within an Andalusian house are surrounded by legends of the paranormal.

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

Abandoned 18th century weapons factory in the Aezkoa Valley.

The remains of what was the most important religious complex in coastal Peru for over a millennium.

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

The mysterious "Candelabra of the Andes" could represent anything from a god's trident to a hallucinogenic plant.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

An unexpected desert oasis in South America.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

According to the Guanches, the aboriginal people of the Canary Islands, the king of evil lives inside this volcano.

The remains of a magnificent medieval fortress that was the capital of a vast empire.

Vast stretch of tide-pools with a unique Moroccan charm.

Morocco's Argania trees are infested with nut-hungry goats.

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.

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

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

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

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

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.

Mosaics, storks, and brothels—this ancient city has it all.