Watch The Incas Remembered (1986) : Full Movie Online Free Before the fateful arrival of armed Spanish conquistadors in the 16th century, the Incas ruled half of South America, overseeing a vast empire that stretched from Ecuador to Chile. In this fascinating documentary, filmmaker Lucy Jarvis outlines the lost civilization's impressive roster of accomplishments, from important advancements in engineering and agriculture to pioneering feats in medicine -- including brain surgery.