You will get different answers to this question because people often have favorite artists and therefore tend to rank higher museums that have a lot of work from those artists. If you are looking for a list of the top museums based on the amount of visitors that pass through them annually, then check this link reuters.com/article/2008/02/29/us-travel... which has a list based on metrics gleaned from Tripadvisor.com. On this particular list the Louvre ranks first, followed by the Vatican museums.
Another good source with a list of the top museums in the world is virgin-vacations.com/16-top-museums-of-t... which has a list of sixteen museums. Here again the Louvre ranks first followed by the Metropolitan Museum of Art in New York. For a list of the top art museums in America/the United States, check this link http://www.43places.com/lists/10509/travel-holidays-best-art-museums-in-america which has a list of the top 25.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.