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