They used to give tours that went to all levels of the silo (there are like 20+ levels) but the bottoms of the silos flood unless you run diesel pumps a lot. They said it was unlikely they would offer them again. Also Patrick Stewart touched the missile with his bare hands and fucked it up in his arrogance despite being told multiple times not to, apparently (the oils in your hand are corrosive to the alloy used for it).