Still playing it almost obsessively....
Seriously people, if you're into city builders, and I've made no secret of my fondness for those sort of games, then play this, it's utterly mind blowing. You can basically create a fortress in a manner similar to Dungeon Keeper, only with much more detail with regards to management, and then enter the 'Adventure' mode and start wandering around what you created (assuming you can find it) learning about its history.
Really great game, just goes to prove my point that you don't need uber-shiny graphics if the gameplay is good and original enough.