This program presents the Inca system of terracing, the growth of potatoes and corn, and the remarkable transportation routes where messages were sent thousands of miles by Inca runners. Also explores the mysteries of Inca architecture as exhibited in the still fabled city of Machu Picchu. In spite of having no written language, government accounts were recorded by a system of knotted ropes. The episode closes with an acknowledgment of the Spanish chroniclers who were the first to record Inca history in written form. As the Spanish conquered Inca territories, in Japan, the samurai warrior class was established and so began traditional Japanese isolationism.