I don't know what kind of silo it is (nuclear or what) but there is a military silo off of a forest road way back off the main highway in the Umtanum GMU in WA. There is an old fence around it -dome shaped with shrub growth over the sides. It's a pretty big silo - mostly underground - I think??????? I didn't hang out too much - I was busy trying to kill an elk I never saw.....