Holy crap, someone in my family listened to me for once...
BAT LORD'S CASTLE!!! ^OO^
It is missing a few things - one minifig and a red window frame, but still CLASSIC CASTLE!!!
I spent, like, three hours putting this together last night. Yes, I could have done it faster, but my wife was sleeping on the couch about 7 feet from me and I had to keep quiet about it. I missed these older builds. Kind of makes me want to dig out old instruction manuals and re-build some of them. That said, there is one thing about the new manuals that makes them better than the old ones - they tell you which pieces you need for each step. I had to keep going back and double-checking things in case I missed something. Which I did several time.
I suspect someone at Lego in the late 90's was a fan of the Ultima series of computer RPG's from Origin Online or one of the Ultima designers was a fan of late 90's Lego. The Bat Lord's Castle reminds me of Blackthorne's Castle from Ultima 5. Hidden passage behind a fireplace, hidden passage behind the throne, big columns all over the place, just so much AWESOME.