Castle Greyhawk

Though not far from the Free City it self, Castle Greyhawk might as well be a world away for all the resemblance it bears to the city of the same name. The castle is inhabited, ruled by one Herzog Akitrom the Merely Worried. He rules benignly over the several hundred citizens of the keep. No one rules over the teeming labyrinth, filled with monsters, that lies under the castle.

The courtyard is surrounded by a circular wall more than 400 feet in diameter. Within this wall stand two towers- Herzog's Sanctum and the Tower of Wizardry-and one large keep called the Citadel Union. There are shops and inns in the union, and the residents of the castle treat treasure seekers well (you never know when one might come out of the dungeon a very wealthy person). Of course, most of them never come out again.

This setting is described fully in the Castle Greyhawk module. If your players are interested in exploring it, DMs are advised to use that module.