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

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

This deceptively salty lake looks like blushing pink lemonade.

Nature’s skyscraper launches out of the terrain with attitude.

At the center of an island in the middle of the Indian Ocean is a deep chasm ringed by tall waterfalls.

This "dead marsh" sits among the largest sand dunes in the world, a forest frozen in time.

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

Climb atop one of the world's longest and heaviest trains for an unbelievable journey across the Sahara Desert.

The runoff from these fiery cliffs sends red water flowing into the sea.

Fabulous formations, weird and wonderful wildlife.

The centuries-old trees lining both sides of this dirt road may become Madagascar's first natural monument.

Magnificent Roman ruins lie vulnerable to destruction on the edge of the Mediterranean.

A deserted Bedouin village lines the shores of this stunning desert oasis.

Landscape of bizarrely shaped desert mountains and innumerable rock carvings.

A beautiful oasis town dating back to the Roman period still serves as reprieve from the brutal summer sun in Libya.

A fortress-like granary that has been continually in use for more than nine centuries.

Strange sandstone canyon known as the "place broken by itself."

Just outside of Nairobi lies a large estate surrounded by endangered Rothschild giraffes, who have been fed from the window by Mick Jagger and Walter Cronkite.

The world's largest church atop a political fault line.

The first mosque in Ghana is known as the "Mecca of West Africa."

Where thousands of slaves passed through the "Door of No Return."

This series of rope-style bridges brings visitors into a jungle layer that is usually reserved for birds and monkeys.

Massive stele returned to Ethiopia after 70 years in Rome.

Reaching the "Church in the Sky" requires scaling the cliff face of a sandstone pinnacle with a 650-foot drop.