WooHooMan
Auror
Earth Sea (Earth Sea series) by LeGuin - unusual island culture, old time favorite, made into a movie that flopped.
Her book "Always Coming Home" has one of my favorite fictional settings - mostly inspired by contemporary Native American culture. However, you can debate whether or not it even qualifies as fantasy (I think it does but whatever).
I also think you should include the Howard's Hyborian Age, Burrough's Barsoom, Lovecraft's Dreamlands and Baum's Oz. They all predate Middle-Earth and I've always seen those as the original constructed worlds by which all later fantasy worlds are compared to. Though, the latter three don't really have much in the way of real-world equivalents with their cultures so they may not be super useful in this discussion.
I would like to point-out that I've heard people use the video game Morrowind as a great example of an unique fantasy setting. The main real-world parallel was Roman-era Israel though it takes a lot of inspiration from Lovecraft's Dreamlands (at least, I think so).