Not sure it fits the bill, but I spent an evening watching various Chernobyl videos on YouTube. There were a few decent documentaries.

YouTube, no, but there is an audiobook version of The Sword and The Shield by Vasili Mitrokhin, which is a history of the KGB based on documents he smuggled out while working in the archives for a couple decades before defecting post Cold War. I got it on audible, it is about 32 hours long but fascinating.

Happy People is one of my favorite documentaries. It's about a trapping village in Siberia. Here is the trailer: https://www.youtube.com/watch?v=4QXa_gn0EFc