We have 3 silos. The largest one was built in the late 60's. It is about 70 or so feet tall and 20-24 feet across. Are they worth anything? Sure would like to rid them if they are not being used. I have heard of people knocking them down like a tree using a sledge hammer and then hoping it falls where it is sposed to. I have found some old silo cement hunks, 1'x2'. I used them for a small patio. I also thought of using it for advertisement beings it tops the trees and is visible from I-35.