Borneo is the richest rainforest island of all; home to 40,000 species of plants and animals. 6,000 of them are unique--and more are discovered almost daily.

The Namib Desert is one of the oldest deserts of all. It's also one of the most diverse. With 50-degree temperatures and half a millimetre of rainfall annually, we see how this is possible.

At the very end of East Africa's Great Rift Valley, there's a "land that time forgot"--the rolling grasslands of the Luangwa Valley.

Journey from the lava ramparts to its fiery heart, we'll discover how this place became one of the most important areas of biodiversity in the world.

At the far tip of South America, lies a magical realm that seems frozen in time. Known as "the end of the world", this is Patagonia.