Queens Museum of Art
When you have so many wonderful museums in the city it is only inevitable that other smaller museums get overshadowed. I have never actually been inside the Queens Museum of Art (located in Flusing Meadows) but I think I'll be dropping a visit when I get the chance. One exhibition that seemed interesting from their website is a Panorama of New York City which is a small structure of all the boroughs of NYC featuring every single building that was created before 1992, resulting in almost 900,000 small structures!! I'll take a picture of my building when I get there :).
More info: http://www.queensmuseum.org