You can get a mini tour of the boneyard if you go to the PIma Air Museum just south of the base. Nobody is allowed off the bus and you only get a whiff of the inventory, but it is really impressive. I believe that the mothballed aircraft alone make it about the world's 5th largest air force.
I drove down Kolb Road in the 90's. There were B-52 tails visible in all directions. Most of the SAC fleet was taken there and beheaded with a giant guillotine. The body parts were left on the ground for 3-4 months so Russian satellites could photograph them to verify our compliance with SALT II treaty. Used to be able to see the carnage on the early satellite image programs, maybe a bit before Google Earth made its debut.
We should never have done that to any airplane (except maybe some of the butt-ugly British ones

)
If you ever go through Tucson, don't leave without a visit to the PIma Air Museum. They have some really unique examples in their collection.
YB