Been a while since I actually FINISHED a map :P
Anyway, Antareus Core started out just as a little experiment with vertex manipulation and the like.. then it turned into a small arena. It grew, shrank, grew some more, and turned into this, all without using a SINGLE custom texture or sound.
Every minute or so the catwalks lower and a teleporter to the egon activates.
UPDATE 11/19/07
In the time since I've been here (damn addictive MMO's) Filecities has changed into Filexoom, died, been resurrected, and been redesigned twice.. I've updated the download link for this, what I consider my greatest mapping achievement.