Ask HN: What are some of the best documentaries you've seen?

This questions has been asked before [0][1][2], but I'm thinking that in the last 4 years something new and exciting has been created or discovered.

If you could describe in a couple of words why you mentioned what you mentioned, that would be fantastic.

[0]: https://news.ycombinator.com/item?id=18085765

[1]: https://news.ycombinator.com/item?id=18537512

[2]: https://news.ycombinator.com/item?id=18271167