This isn't a cheat, just something that's kind of cool for the Italy map. If you're in free-look mode, go into the house with the fruit wallpaper. As soon as you're in, head straight up and you will see a room. Go towards it. In the room is an old rennisaince mural. I guess you could get here by adjusting gravity and no-clipping, but doing it while in free-look is a lot easier.