There is so much there, and more than just art hanging on walls, so it really depends on what you like. @iamthemob – roof garden is usually only open in nice weather, I think.
There is all kinds of furniture, if you like early American, whole rooms done with like you are actually in the room, French, ditto. Stained glass, facades of buildings, medeival armor like @gailcalled said, including Samurai costumes, etc. Religious artifacts, Hawaiian and Pacific art. You could spend a week there. I think I read it’s the largest Museum in the Western Hemisphere. I saw a great exhibit once on clothing that rock stars wore, which was very interesting. If you are into East Asian art, you’ll find that there, as well. If you like silver, you’ll find tons of silverware….
Literally you name it…....