Stupinigi is the summertime hunting palace of the Savoys. Set on what used to be the outskirts of town (now it's out close to the mall), this vast summertime estate is an immense monument to the power of the Savoys. The rooms are beautifully decorated, despite the fact that much of the original furniture is missing. The center of the palace is a grand ballroom, and if you close your eyes you can just imagine all the social functions that went on in the room. Part of the palace is closed to the public, which makes the size of the place even more amazing.
You can catch bus 66 out to the palace, just ask the driver for "Stupinigi", and he'll tell you where to get off. When you are waiting for the bus after you've seen the place, you can grab a gelato at the little restaurant across the street.