The North Carolina Museum of Art in Raleigh was one of the first to have a gall
ery for the blind.  I believe that teh Hirshhorn also has some designated piece
s that can be touched.  Lastly, you might consider the use of computer technolo
gy that has audio capability.  In this regard, I suggest you contact:
                 Susan Brummel
                 Clearinghouse on Computer Accomodation
                 GSA, Room 1234
                 18tth and F Streets NW
                 Washington, DC  20405
The Smithsonian has an accessibility office.  The coordinator is Jan Majewski a
t 202/786-2942.  I hope this gives you a start.