For nearly 100 years, the Incas ruled the largest empire in the history of South America. They had a society based on community and cooperation, with power controlled firmly by the Sapa Inca and the royal family. They were brilliant engineers, constructing magnificent forts and cities, and built roads, tunnels, and bridges through mountains. Their medical and surgical techniques were highly advanced, as were their observations of the sun, moon, and stars. But, above all, their devotion to the gods was the most important aspect of their lives. Invasion by Spanish conquistadors in the early 1500s began the demise of the Incan empire. Accessibility options on the DVD are: (1) expanded description, (2) English subtitles in a black box.