Quite a bit of time ago, I created a list of my favorite films. Summaries are (mostly) from IMDB.
This first post lists my favorite documentaries, in alphabetical order.
NB: Please note that when no nationality(ies) is specified, the film is from the U.S.
Some comments/warnings regarding problematic content are in bold. (In other words, there may be additional such content which I have not marked, but I focused on warning about things the film and its description did not deal with well. An example of this would be 'Gone with the Wind', which is horribly racist as a film and which IMO requires a warning.)
Please note that some of these films are in my list because they were influential, not because I objectively think they were great. In some other cases, they are still in my lists (with warnings) to remind myself that I need to rethink some of my earlier opinions. :)
Documentaries