One does not wait in the hot humid weather and fight the crowd to get a good view of the Mona Lisa or study the brush strokes of Leonardo de Venci.  All this effort is to simply snap an phone picture of it, or worse, a ‘selfie’…  It is behind glass, so all photos have glare and reflections of other phone photographers. The end result is a snapshot of very poor quality. If you really want to see it, you would go to an art book. There is no organization, like a clockwise flow, entrance and exit. You have to struggle just as hard to get out of the mosh pit as to get in!  I think a LOT of travel is just so one can say, “I have been there….”