I enjoyed Slow Burn a lot. It's an eight-part series about Watergate. Really interesting. And episodes aren't crazy long either. Like 28 minutes or so.
Atlanta Monster is really good, too. It's a bit sensational at times, but it's a pretty fascinating look at one of the worst serial killers in our history - and it makes you question whether Wayne Williams is guilty at all. I was a young boy living in Atlanta at the time he was arrested, so it's particularly interesting to me.
Also. Seminole Headlines and Wake Up Warchant are terrific. Obviously.