I was going to post in this Trackside thread
Monza advice, but that was about visiting Monza for a race meeting.
What I am interested in here is visiting it inbetween races, perhaps mid-week. Is there anything to see or do? Can you see the famous banking? Can you wander around and see the ghosts of races past?
http://www.monzanet.it/
The official website seems to suggest you can enter and look around, but has anyone any experience of this?