No, I'll have to disagree here. I've spent around 10 years in several universities both in Europe and the US and most of them are closed during weekends and you

No, I'll have to disagree here. I've spent around 10 years in several universities both in Europe and the US and most of them are closed during weekends and you can't walk around and touch experiments when no one is around. MIT is special in its openness, or at least the Medialab is (you can't really walk in any lab of the Physics department).