Castle Blackmoor, site of the first RPG Dungeon in history. But the Castle is more than just the dungeon. What adventures can be found above ground level? Aldarron has started a project to flesh out the rooms of the Castle itself over at Dragonsfoot.You can participate by clicking on this link.
I was a little disappointed when the actual Castle was left out of the Dungeons of Castle Blackmoor Sourcebook. Maybe this project can help fill in the missing details?