Stadio Giuseppe Meazza (San Siro) in Milan
|Internazionale Milano Football Club (Inter Milan) and Milan Associazione Calcio (AC Milan)
|Information on Wikipedia
For a very small amount you can have a tour. I strongly believe that the tour you will get, depends on the team the guides are supporting. In my case the guide was an Interista, so he didn't mention AC Milan one single time. The inside is not very impressing. But then you can get out on the stands... whaow!
For more information, click on the link to Wikipedia.