/lit/ - Literature

Surprised no one has mentioned Dan Carlin's Hardcore History series yet. WW1 and Mongol Invasion ones are both excellent, currently making my way through his Japanese one.

Regardless of what you think of Carlin himself, he doesn't try to tell you what to feel or think about the events. He offers first hand accounts wherever possible and a range of interpretations from all sides of the political spectrum. Also they're long enough to be audiobooks in their own right.