This list is (obviously) packed with a variety of biopics, and there's one that just couldn't be left out: Martin Scorsese's "The Aviator." Leonardo DiCaprio plays genius inventor, philanthropist, and film director, Howard Hughes, who not only helmed the 1930 movie "Hell's Angels," but also built aircraft for the US Air Force in World War II. The film charts his life as he struggles to cope with obsessive-compulsive disorder.