Since I began a new play through of Oblivion tonight, I found you the best name ever: Imperial City Sewers.
Black Mesa? I guess it depends what games you are fond of (other than HL series).....no point renaming it after a game you are not interested in
Why didn't I think of that! There are many ruins around the world of Tamriel (Oblivion) that have cool names. Can't think of any of the top of my head, anyone else know any?