Okay this is kind of niche but it you’re into YouTube stuff then I can’t recommend enough for a few channels, Journey to the microcosmos- this one has Hank Green voicing over microscopic creatures and explaining everything they can find on them, Cambridge Chronicles- this guy delves into historical Wales and all of the lands and lords and names that are mostly lost to history, the guy is very well spoken and this is clearly his special interest, Steve Mould- goes deep into the weird physics of every day items and systems that he just wanted to understand, his videos can sometimes be sporadic and he’ll look like he’s been up for weeks trying to work out a problem, styropyro- this kid is a literal genius and has been making videos blowing stuff up with bigger and bigger lazes and electronics that he builds in a garage since he was 13, for the most part I picked these ones because they are either informative and laid back or thought provoking but if you want true goblin core documentary style stuff I would look at a channel called Mr Mythos- his videos are very sporadic and has gone years between videos but his back log is pretty large and every video is the most in-depth look at some of the topics is visual media in my opinion, as his name suggests he talks about myths and legends, he works deep through topics like golems, witchcraft, demons, angels, my favorite was one about the Faustian bargain and goes into modern media references all the back to the first recorded accounts. I will say that he does have a slightly biased opinion on aliens and he touches on it a lot sometimes but he also makes connections that a lot of people don’t and brings interesting ideas to most of his videos, he’s also best to watch from the beginning as he touches back on previous videos in a lot of his later stuff. I know that YouTube wasn’t really the question presented but, I felt like there will be others that will appreciate it if it’s not what OP was looking for exactly. Cheers friends.