A hollowed-out baobab that became the horrific final resting place of leprosy sufferers, with gruesome evidence to prove it.

Giant disc-shaped gate took 20 men to close off this city in Madagascar.

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

This underwater cave in Madagascar is home to what is thought to be the country's largest fossil graveyard.

Fabulous formations, weird and wonderful wildlife.

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

This triumphal arch is the only fully standing structure that remains from Roman-era Oea.

Surrounded by a smudge of dark earth, this isolated volcano sits in stark contrast to the surrounding Sahara.

Early Islamic mosque with several strange conical domes.

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

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

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

Landscape of bizarrely shaped desert mountains and innumerable rock carvings.

The dead gigantic radio tower of Liberia.

A comprehensive museum dedicated to Africa's oldest modern republic.

An abandoned mine pit is now a beautiful, colorful attraction.

Empty since 1989, now falling into ruin.

The Kenyan town where the best distance runners in the world are trained.

This colonial fort is an intriguing example of Renaissance military architecture.

Life and death are on parade at the most reliably perilous site of “the Great Migration.”

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

Located in Nairobi National Park, this animal orphanage is the oldest of its kind in Kenya.

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.

Abandoned city hidden from the world by tropical forest and isolation on the coast of Kenya.