These naturally balancing rocks were pictured on every Zimbabwean banknote, up to the 100 trillion-dollar note.

The largest prehistoric ruins south of the Sahara, once a powerful center of international trade.

A strangely forgotten claimant to the much contested title of "Source of the Nile."

The burial ground of four Buganda monarchs was nearly destroyed by a devastating fire.

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

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

A seemingly simple canyon that was the backdrop to a number of famous movies.

An ancient burial ground believed to have been used for ritual sacrifice.

A 15th-century granary that played the role of futuristic slave quarters in the world of 'Star Wars.'

The best-preserved Roman small town in North Africa.

The original film set of Luke Skywalker's Tatooine home from the 'Star Wars' trilogy.

Buildings from the fictional planet of Tatooine still litter the Tunisian desert.

These strange piles of magnetized volcanic ash travel across the desert about 50 feet per year.

After sunset the heart of Zanzibar's historic Stone Town neighborhood transforms into a culinary playground.

This rare volcano spews the strangest and (literally) coolest lava in the world.

Human ancestor’s 3.6 million year-old footprints.

This sacred, circular cave is lined with pools so clear and still that it's hard to tell where the water begins.

The largest game reserve in Africa is home to thousands of species but refuses to house humans.

Stunning ruins of what was once the center of one of the greatest empires in East Africa.

A salty red wasteland in Tanzania is a breeding spot for endangered flamingos.

Crumbling pyramids and temple ruins stand within the shadow of this sacred butte.

Every Friday, Sufi dervishes whirl around the tomb in a trance-like state as part of a sacred ritual called dhikr.

Remains of an abandoned coral city.

All that remains of Jacques Cousteau's 1960s underwater "village."