The Incas considered Lake Titicaca the sacred birthplace of the universe and their people. According to one of many oral histories, Manco Capac—the first ruler of the Incas—and his sister, Mama Ocllo, emerged from Lake Titicaca and headed north with a golden staff given by the Sun God. They were to find a place where the golden staff sank into the land and establish a settlement there. The place they found was Mount Guanacaure in the Acamama Val…