The Inca Empire was the largest ever to emerge in South America – ruled from a spectacular capital, Cusco. This mysterious city in Peru was said to be so dazzling it had a temple decked in pure gold. Why did the mighty Inca civilization that lived here fall to a handful of Spanish Conquistadors? New evidence - from unearthed mummies to microscopic DNA - reveals the role of this city and sheds new light on the biggest mystery of all: why did the Inca empire come crashing down?

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