Bragr
Banned
Not sure if it qualifies as a documentary, but Tribe might be the most impressive thing I have ever seen on TV. Bruce Parry travels around and lives with various tribes, and he doesn't just stay for a weekend and leave, but he lives with them for a good while and does all the stuff they do. It's extremely eye-opening to how people live and how we lived in the past, you learn a few things about life. It's some of the most valuable footage put to film, the amount of effort he puts into all these travels is absolutely incredible.