One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

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

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

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

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

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

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

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

Houses are tucked between, on, and underneath giant boulders.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

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

A desert that rolls right up to the ocean, where it's so dry animals live off the fog.

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

An awe-inspiring mosque in Morocco with one of the tallest minarets in the world.

Traditional 11th-century outdoor tannery.

God's Saharan sandbox of wrath.

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 other side is actually green.

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

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

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

The house where the famed outlaw was shot by a dirty coward is now a museum to the criminal's legacy.

A mysterious light of unknown origin on the backroads of Missouri.

This recently restored timepiece has stood all around Kansas City.