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

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

Designed as a labyrinth, this subterranean prison was crafted without bars or doors.

The largest cactus farm in Africa.

The true depths of these stunning Moroccan caves are unknown.

Traditional 11th-century outdoor tannery.

Deliberately hidden for centuries, the magnificent Saadian Tombs were eventually uncovered in 1917.

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

Exploring the wilder, more passionate sibling of Erg Chebbi feels like discovering a secret sun-kissed planet from another galaxy.

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

Reaching this rock formation involves a hike through rocky rapids and springs where wild turtles reproduce.

In this desolate valley resides a gorgeous set of rocks sporting a technicolor design.

Enjoy fresh-baked bread and fish from a repurposed Portuguese fortress.

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

Along the most northwestern point in Africa is an ancient cave surrounded by legends.

One of the most spectacular canyons in the world.

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

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

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

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

Most-visited and most-photographed slot canyon in the American Southwest.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

Rippling sand dunes frozen in the Arizona rock.

A plaque marks the site directly below the mid-air detonation of the atomic bomb over Hiroshima.