Most documentaries I've seen have "VH-1 Behind The Music" in the title. I also enjoy anything about outer space. But as far as cinematic, artistic documentaries, the best I've ever seen is "When We Were Kings" about Muhammad Ali and George Foreman. Ali was at his transcendental apex -- a global figure -- he was probably the most famous person in the world at the time.

An international survey asked movie buffs about their must-see documentaries. Here's what they said:

[SOURCE: REDDIT]