If we are heading over to Europe, in Paris a smaller museum on beautiful grounds is the Rodin Museum.
Something I found interesting is that the same gentleman who planned and carried out the evacuation of the majority of the art works from the Prado during the Spanish Civil War to make sure they were preserved was then called upon to do the same thing regarding the Louvre in WWII. It was not only for preservation purposes but also because Hitler intended to create a huge Nazi art museum after the war was won by Germany and Nazi leaders tended to steal great works of art for themselves.