Topics I’ve never heard of

I'm working on a reading challenge and one of categories is 'a topic you've never heard of'. I'm thinking things like obscure historical events, uncommon sports/games/hobbies, unique careers, (can you tell I usually read non-fiction?) or whatever else you can think of. It doesn't have to be non-figure.

I've tried to research but it's hard to search for something you don't know. I've looked through posts recommending random topics but most of those are indepth books about mundane topics. Don't get me wrong, I added a lot of those suggestions to my to-read list as they sound great but they don't necessarily fit this challenge.