This remarkably well-preserved mosque stands amid an 11th-century caravansary.

A geological bull's-eye visible from outer space.

The second largest monolith in the world was once betrayed by its lover, Ben Aicha.

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

An extraordinary mix of Phoenician, Roman, early Christian, and Byzantine ruins beautifully set overlooking the Mediterranean.

The original resting place of Queen Cleopatra and Mark Antony's only daughter.

A rustic place to spend the night, complete with amazing quiver trees and outsider art.

A rare cluster of alien-like plants grows along a dusty highway.

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

The remains of diamond fever taken over by the desert.

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

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

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

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

Africa's fourth longest river originates from a burbling spring in a secluded stretch of woods.

Once a meeting point for Swahili slave traders, this ancient tree is now a monument to those killed by the slave trade.

An obelisk marks the spot where a British explorer's heart was buried before the rest of his body was transported to England.

A stone memorial marks the spot where the fighting of World War I finally ceased—three days after the armistice was signed in Europe.

This stunning waterfall is the backdrop to a site that has seen continuous human habitation for 250,000 years.

Arrogance and quarreling are forbidden near these three sacred waterfalls.

This fascinating cave is packed with prehistoric rock art and Stone Age tools.

A secluded natural oasis hidden deep along a rainforest trail.

Designed as a labyrinth, this subterranean prison was crafted without bars or doors.

This was the second largest mercury mine in the world and one of the oldest preserved mine complexes in Europe.