Poll: Favorite Ken Burns PBS Documentary

Director Ken Burns's Florentine Films is currently in-production or filming a number of other upcoming PBS documentaries. The documentaries cover a wide range of intriguing topics including Ernest Hemingway, Muhammad Ali (????), The Holocaust and the United States, Benjamin Franklin, and LBJ & the Great Society. Which Ken Burns directed PBS documentary movie or mini-series is your favorite, so far? Discuss the topic.