My favorite series of Hardcore History is Death Throes of the Republic[0]. It discusses the rise and fall of the Roman Republic and particularly Julius Caesar. This time period has an abundance of resources that provide plentiful discussion, and it’s full of incredible characters. I should probably find a book on the topic because I was glued to every word of each episode.
If you like that, try the History of Rome podcast, it goes through each and every single era of Western Roman history. It took me a few months to get through all of it and another few months to get through the History of Byzantium one which is still ongoing.
Other History Of podcasts are also interesting, such as the one on China, I haven't gotten too deep into that one yet.
[0] https://www.dancarlin.com/product/hardcore-history-death-thr...