Since you guys told yours, I'll tell you mine.
Thunder's idea comes off in several stages. For the sack of not filling this post up with several paragraph's, lemme just list off his First Stage. Basically, it starts off as sort of a, mmm, medieval city? No, it'd be style'd like that, but it'd be all techno'd up. There'd be a castle at the highest point of it, where Thunder works in his lab. It'd be a safe zone for players, the taxes wouldn't be too demanding and it'd be the start of fun and adventure and stories and legends, so on and so forth.