I always wanted a world map in my document. I love game maps! They make you want to go and explore all these cool places you haven't been to yet... Icewind Dale had the best maps (and best character art) ever... Anyway!
Again - I did a map very early on. It was pretty - if a bit unfinished -and completely useless. It didn't have any relevance to the game's story (because it didn't exist yet) and was more suited to a high-level pitch document than a GDD. I never finished it.
Edit: forgot these!