r/Geedis. It's a subreddit about merchandise from a fantasy franchise from the 1980's called the Land of Ta. Unfortunately, the Land of Ta is incredibly obscure–there are no books, VHS tapes, or anything else to show it ever existed. And yet there are several pieces of merchandising, like stickers of the characters. It's just a weird little mystery with a subreddit about it.
Edit: Another small, interesting but probably not quite as weird subreddit is r/comicstriphistory. Interestingly, someone on a Geedis thread suggested that the Land of Ta might have been a comic strip, so there's a bit of overlap between the two subjects.