The SAC Museum near Lincoln, Nebraska has a B-36 on display indoors:
http://www.strategicairandspace.com/...ions/B-36.html
There's one outside at Castle AFB Atwater, California:
http://www.elite.net/castle-air/
The Pima Museum at Tucson, Arizona is restoring a B-36. When I visited last year it was still in pieces outside but if you ask nicely (as I did) they let you poke around it (under supervision of course). Website currently down.