Miles of man-made caves and tunnels are currently used for cultivating mushrooms.

The largest underground church in Europe.

Hundreds of dwarf beeches create an unusual, haunting forest in the north of France.

It took 40 years to build this Eden-like garden in Marrakech, later restored by Yves Saint-Laurent.

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

An eerie former warehouse turned cistern turned movie set.

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

World's largest film studio, where visitors tour the decaying sets that litter the harsh desert environment.

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

One of the tallest waterfalls in Africa is also home to a population of monkeys who enjoy the waters and the occasional guest.

One of the most spectacular canyons in the world.

This grand hydraulic installation has provided water for townspeople since the Middle Ages.

Founded in 670, this ancient mosque is an architectural time portal.

The best-preserved Roman small town in North Africa.

The true depths of these stunning Moroccan caves are unknown.

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

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

The other side is actually green.

Traditional 11th-century outdoor tannery.

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

The ruins of an early-18th-century complex that could once house up to 12,000 horses.

This massive stone and steel monument remembers a century-old battle that cost thousands of lives and nearly destroyed the city.

This incredible stone temple is a monument to death, victory, and fantasy architecture.

An underground city of salt.