A Turkish monastery tucked into a cliff wall.

Flames have been burning within this mountain for more than 2,500 years.

An abused and forgotten metropolis, abandoned for centuries.

Hidden just under the waters around this Turkish island are the ruins of a once great city.

A Lycian city of the dead carved into the hillside of Southern Turkey, complete with startlingly human touches.

This hunter-gatherer architecture is believed to be the oldest religious complex known.

A deadly ancient portal to the underworld.

These tombs were built into the side of a mountain so that ancient angels could reach the dead.

Rock-cut chamber at top of an outcroup, reached by a mountain stairway of forty steps.

What was once supposed to be the symbol of a shining Afghan future is now a bombed-out ruin.

Despite a history of destruction, this former citadel survives to document Afghanistan's oft overlooked history.

Highly unusual subterranean stupa and adjacent cave monastery.

Once an impressive link to Afghanistan’s Buddhist past, now a sad reminder of intolerance towards other cultures.

Six rock shelters covered in abstract art created by ancient Ugandan tribes.

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

Where the White Nile River dramatically cascades between Lake Kyoga and Lake Albert in Uganda.

A salty cave excavated by elephants and the location of a deadly disease vector.

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

Get tall with nature's lankiest beasts and their warthog friends at this Kenyan preserve.

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.

After surviving decades of medical testing and civil wars, these chimpanzees were abandoned on their own islands.

The petrified remains of 150-million-year-old trees can be seen in and among the houses of the local villagers.

One of the largest concentrations of rock paintings in Southern Africa.