My problem is trying to detangle my interests in this regard. I've always been interested in mythology, comparative religion, history (especially medieval), and some tolerably obscure authors. Add roleplaying games into this mix leads to all sorts of questions of "Did I learn that while figuring out something for a campaign or because of a sudden interest in X topic?"
So, a lot of vocabulary (including highly specialized terminology regarding armour, philosophy, and biology), knowledge of many legend cycles, prices of various common items in the 15th, 16th, and 17th century, basics of statistics, interesting food & drink (both in terms of lore and recipes), new types of music and instruments, migration patterns of nomads, etc.
But as I say, rather hard to determine which particular strain of my interests and studies lead to any particular batch of trivia
