I would like to recommend Dan Carlin’s Hardcore History Podcast. I had heard several recommendations for this podcast, but had not gotten around to checking it out. I finally did and think it is a great podcast. I have only listened to his series on World War I and I have gained lots of insight.
In my schooling, WWI was largely overlooked and the teachers always jumped to the 20’s, the Great Depression and then World War II. From this podcast, I have learned a lot about the origins of this conflict, how it changed society and how it is still affecting us until now. It is more than just a recitation of facts. He brings history alive with insights and stories from a unique perspective.
I will warn you though, this is a long podcast series. They appear to be coming out quarterly and each episode is 3-4 hours long. Even at that, I still consider it a good investment of time. I am looking forward to the completion of the WWI series. I also intend to listen to more of the archive. He also has a podcast called Common Sense which I would recommend. It is focused on current events. I have only listened to one of those and enjoyed it as well.