According to Wikipedia you can find there one of the world's largest and most inclusive collections of art, from the colonial period to the present, made in the United States (.wikipedia). Currently they alos show the "Lationo Presence in American Art" (through March 2, 2014)
I enjoyed especially the Hopper´s and Warhol`s Marilyn. I also was impressed by the collection of contemporary art, including a huge video wall by the Korean artist Nam June Paik called "Electronic Superhighway" (collections). And there is a lot more to discover.
Let the pictures speak for themselves.