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I can't think of any MMO that has so many diverse looking Zones. Every single Zone in WoW feels like something new and they don't have only the typical Desert/Snow/Grassland areas that you see in most MMO's, they have weird exotic looking places that have a range of many colors.
Can any of you think of a MMO that has such a diverse range of settings like WoW has? I can't and as far as I know Guild Wars 2 only has the typical Desert/Snow/Grassland areas with minor variations in between.