Trillbilly Worker’s Party is always good, their meandering ramblings on late stage capitalism, environmental collapse, and religion scratch an itch for me
Fall of Civilizations had a good episode on Byzantium that’s a few hours long, although it is better as a video because of all the gorgeous drone footage of the Bosporus and Istanbul they used was mama mia 
I haven’t seen all their stuff yet but I’ve enjoyed it quite a lot, I can just personally vouch for the Byzantium episode as being quite informative and well done