There are several museums housing large collections of miniatures in the U.S. that I'd love to visit someday.
One of them is the Thorne Rooms at the Art Institute of Chicago: http://www.artic.edu/aic/collections/search/citi/category%3A18
The Kaye Browning Miniatures Collection at the Kentucky Gateway Museum: http://www.kygmc.org/miniatureExhibits/
There are a number of my pieces, as well as many from miniaturists friends, on display. She has a world class collection and I'd love to ogle it all!
The Masters of Miniature collection at the Naples Museum of Art in Florida: http://www.thephil.org/museum/museum_collections/sculpture_3D.html#Miniatures
There is this one in Canada too: http://www.miniatureworld.com/