I saw a B-36 at Castle Air Museum in California last year. That thing was huge.
http://www.castleairmuseum.org/convair_rb36h.html
We were walking around in 107 degree temps that day - we cut the outside visit short.
I think there are only three left in the world. One is at the USAF Museum at Wright-Patterson AFB in Ohio. Unfortunately, it is inside a building and it is impossible to get back for a good view of it.
The museum is splendid BTW, it is just that the B-36 inside the building BECOMES part of the building.