For history:
Revolutions by Mike Duncan. You can start with the Haitian and the Mexican revolutions. Then just listen to whichever season you want.
Dan Carlin's Hardcore History.
The History of Rome by Mike Duncan.
These are absolutely amazing.
Honorable mentions for Behind the Bastards and Lions Lead by Donkeys, if you like some banter along with the story telling.
Edit: someone in here reminded me about Your Undivided Attention. It is, literally and without irony, the most important podcast you could ever listen.