This staircase full of Mayan hieroglyphics is perhaps the largest single text in the world.

The designated Jewish quarter in Fez dates back to the 15th century.

The courtyard of this small Marinid madrasa is a dazzling example of intricate Islamic architecture.

Traditional 11th-century outdoor tannery.

Thousands of narrow alleyways in an ancient medieval city make up what's believed to be the world's largest car-free urban zone.

The other side is actually green.

The most biologically diverse protected area in Africa is also the most dangerous.

The world's only facility where orphaned mountain gorillas are cared for.

Mount Nyiragongo has erupted at least 34 times since 1882 and is home to the world's largest lava lake.