Castle Greyhawk: The Lost Works of Da Vinci

Castle Zagig is supposedly the castle. There's a couple iterations of it, but even that, none of it seems right. That might just be because like once you see it, it loses the mystery and you're always going to be disappointed by the solution. And I think that overall Greyhawk became like this thing that TSR felt like they had to put out because it had the name recognition,. But then it never gelled the way that other forgotten realms did.