We walked through the Vatican museum rather quickly on a tour, it is impressive in terms of size and scope.  I've been to the British museum, folks scurry about to check off seeing the famous paintings there and ignore anything quasi-famous.  There would be a pack of them flying down the halls to see "Sunflowers" and taking no time for anything else.  It was amusing.  I turned down a chance to see MOMA with family because the Tech-Georgia game was on TV.