Bill Wurtz's history of the entire world, i guess and its predecessor history of japan. They both blur the line of "documentary" a little, but are very good, and his music (beyond those videos) is also great.
Seconding Qxir. His humor + artstyle + accent combine into a really amusing end result, plus he actually does a fair bit of research into the topics he covers.
Along those lines, Sam O'Nella Academy is another channel of "amusing narration + semi-crude yet understandable illustrations + genuinely informative". I started with his video on Tarrare and chortled mightily throughout.
And finally, if we're allowing conference talks, literally anything Deviant Ollam has his name attached to tends to be really good, though he does tend to repeat stuff between his talks. Here is four that's different enough from each other:
I totally forgot to mention Deev's talks in my answer. I have watched most of them several times, and enjoy the different versions/twists on talks he's given on elevators such as Elevator Obscura: Hacks and Curios in the Lift Industry vs Pit/Penthouse. Great stuff.
Defunctland's Disney's Fastpass: A Complicated History is a fantastic dive into the logistics of managing a giant crowd over several years, from approaching it as an engineering problem all the way to exploiting the system for profit. It's such a fascinating problem to me, and it's presented in an engaging and fun way. The rest of the channel is fantastic too!
I'll also recommend Fascinating Horror - these aren't fictional horror stories, these are real disasters told in an incredibly detailed but highly respectful way. They don't just explain the disaster and why/how it happened, but also the regulations that came afterwards to make sure these would never happen again. They're all high quality, but if you want a starting point the Nutty Butty Caves will give you a good idea what the channel is about.
Hey, I think this can be interesting to some of you
There is a Non-profit organisation based in Swiss, that aims to evaluate the quality of Youtube videos, and generates global recommendations from that: tournesol.app
Currently, there is about 25000 videos included (~50% are in French, ~40% in English, 10% other) at the top of English recommendations we can find Kurzgesagt, Science4All, John Oliver LastWeekTonight
If you like to give your opinion, please come by !
This works like that:
Paste the link to two youtube videos, one on the left, the other on the right
Move cursors from left (meaning you prefer the left video) to right (if you prefer the right one instead)
Confirm to update the global recommendations
Pros: The recommendation algorithm used, 100% Open sourced and developed by universities, said to be mathematically safe against a number of risks (strategic voting, bots attacks...) and "more representative to public opinion than commonly used polling methods"
Cons: The current low number of users (recommendations are pretty biased towards living healthly and reducing carbon footprint, for the moment, not a lot of entertainment yet)
Note that I'm not affiliated not part of the associative, I'm only a user of Tournesol, comparing videos from time to time to improve global rankings
Anything from Oversimplified channel. History made funny and fun. I never learnt about the Aussie vs emu war growing up here. https://youtu.be/BXpu6tbFCsI
It is one of Salt's greatest videos, and showcases some of the best editing and storytelling I've ever seen on YouTube. Probably the best part is that you can go in with no knowledge of the game, like I did, and come out fully understanding everything about the game.
I'm a huge fan of "The Alt Right Playbook", which breaks down the dirty tactics the alt right uses to recruit people.
Also a huge fan of "In search of a flat Earth", which looks at conspiracy theories, how they evolve, why people believe in them, and why "the shape of the Earth might actually be the least relevant part of the flat Earth conspiracy".
Jenny Nicholson's videos are great, but her documentary on "The Last Bronycon" is special, as the realization dawns on you while watching that she has more connection to Brony culture than you might have guessed: https://www.youtube.com/watch?v=4fVOF2PiHnc
Agree with 1 and 3. I haven't seen the other ones, they seem interesting.
The only one I can think of right now, because I've seen it like 3 times, is The Internet's Own Boy.
Similarly, Nick Zentner's lecture on the Flood Basalts of the Pacific Northwest. I can't tell you how many times I've watched this exact lecture (although all of Zentner's stuff is great):
So this isn't on YouTube but the Ken Burns Vietnam War Series is absolutely phenomenal and hands down the best documentary I have ever seen, not even close. If you can find somewhere to watch it I recommend it endlessly.