This "tower of death" has acted as an observatory, a religious hub, and an executioner's lair.

Ancient barriers wrap around what was once an important stop along the Silk Road.

Light still pours into the ruins of this ancient Islamic observatory.

The Avenue of Mausolea is a series of grand palatial tombs.

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

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.

Sitting atop a rock on Michamvi Pingwe beach, this restaurant becomes its own island at high tide.

In Zanzibar, a historic 19th-century palace is a reminder of the world's shortest war.

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

This amateur-built East African church with mismatched towers is an architectural abnormality.

The stunningly blue waters of these beautiful caves also have a violent past.

The world's highest and most dangerous infinity pool lies at the precipice of Victoria Falls.

Far from the shore, this sandy victim of the Skeleton Coast looks like it was plopped in the middle of the desert.

Road signs in Namibia mark the location of one of the five major circles of latitude.

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

This deceptively beautiful island was once home to a German concentration camp and known as "Death Island."

The remains of diamond fever taken over by the desert.

The ruins of this mining boom town stand like skeletal reminders of the settlement's dark history.

An enchanting rocky island of scraggly baobabs surrounded by an ancient sea and sprawling salt pans.

This small monument marks the divide between the Atlantic and Indian Oceans at the southernmost tip of Africa.

“The oddest pub in South Africa,” inspired by a practical joke.

Largest cave system in Africa.

The world's largest pineapple building honors Bathurst's favorite fruit.

Mined to a depth of 240 meters with a perimeter of about 1.6 km, the largest hand-dug excavation in the world.