From time to time I talk about world building on this site. I think any writer has to give an awful lot of thought to world building, i.e. presenting a setting that’s not just consistent and logical but interesting.
One of the reasons role-playing game setting books appeal to me so much is that a good one just drips with ideas, and can be chock full of world building inspiration both for writers and gamers. I’ve discussed other great settings, but I’m overdue discussing the Hex Crawl Chronicles written by John Stater.