Tomorrow a group of us from our potter's guild is going to visit the Freer Gallery, part of the Smithsonian Institution. A guild member has arranged for us to go into the stacks that house their ceramics collection. We will get to observe and handle many incredible pots that are not on display to the public. I was able to do this once in the distant past, when I was fairly new to clay. I think that I will definitely get more out of this trip.
I am not sure about the photo policy, but if I can take pictures I will be sure to share. By the way, if you are going to be in the D.C. area, I believe it is very simple to set up one of these tours. I can get you information about it, if you are interested.