I loved doing maps when I played D&D. Most of them never saw the light of day as my gaming groups were never what you would call 'dedicated', but then nor was I. While i was trawling for stuff on my hard drive that might be usefull for the dungeon tiles I came across this one.
I did it mainly for fun and to keep me busy while I was waiting for work to come in. For some reason I had it in my portfolio the last time I was out at WOTC (I think because I just copied everything that looked colourfull into a folder to show to art directors...professional) and I ended up getting comissioned for some battlemaps on the strength of it.