I’ve been listening to a podcast called Fall of Civilizations. It’s about large civilizations and goes into why they ultimately failed (obviously) but also gives great insight into how they became “great” too. I enjoy that they try to give a perspective on what it would be like as a citizen of the empires while it’s collapsing as well. Also, maybe not the definition of broad, but Hardcore History by Dan Carlin is probably the greatest history based podcast out there in my opinion. But, he goes very in depth into each topic (like 5+ hours a show) so it might not be what you’re looking for.