Overly Sarcastic Productions I guess specializes in I guess Cliffs Notes versions of myths and weird fiction, but a guy who posts on the channel called Blue just does history videos that are a lot of fun. 15-20 minute videos that don't go very in-depth but the guy clearly cares and is reasonably knowledgeable so if you just want to marathon (lol) a bunch of history about the ancient world then his videos on Egypt, Rome, Persia, Greece, Byzantium, etc are a lot of fun.
https://www.youtube.com/user/RedEyes...ning/playlists