In the final of this two part series, Bill Sullivan discovers that the ancient Inca myths have been translated into physical representations created in the natural landscape, demonstrating how potent and integrated Inca culture was. The Inca empire began as early as 1200 AD in the city of Cuzco, but it was not until 1438 that it began to expand across modern day Ecuador, Bolivia, Peru, and some of Argentina. At its height, the Empire was the largest nation on Earth and remains the largest nation state to have existed in the western hemisphere. The culture was sophisticated and advanced, with an organised taxation system. It was also incredibly rich and powerful. The Inca Empire at its peak was the largest kingdom on Earth. The Incas were master builders, fearsome warriors and practitioners of human sacrifice. Yet this mighty state was conquered by a small band of Spanish adventurers. 7000 men were killed and 10,000 injured. But how could the Incas let this happen?