I have a thing about Cults. There's a few good podcasts on them. Heavens Gate does a long detailed series about the UFO suicide cult Heavens Gate.including interviews with surviving members and family members of those who died. Cults covers the history of various cults including a lot I've never heard of. Coffee and Cults has more of a conversational vibe but can be interesting. I also like listening to crime podcasts: Criminal takes you through interesting cases and interviews interesting people. They recently did one called The Palace of Justice. Where they interviewed the last surviving prosecutor of the Nurmberg Trials. Case Files. Basically the same thing but with a guy with a soothing Australian accent. Colour Me Dead true crime podcast goes details the cases of serial killers. Serial Killers same thing. Finally Our Fake History a really interesting podcast about the truth behind semi historical figures and events and how they grew to their current (often inaccurate) modern perceptions. People such as Anastasia, Joan of Arc, Richard the Lionheart and places like Atlantis.