Where is the Monza track?

On our way to the airport, we decided to visit shortly the famous Monza F1-circuit since it was almost on the way and it was supposed to be easy to get there. After spending one hour of searching for it, we did not, however, have the time to actually go in to the Monza park where the circuit is located. Although some guidebooks tell that it is really easy to find, I have to disagree and claim that signposts are not consistent enough to show you the way to the circuit if you only have a limited time frame like we did.