Does anyone go over their properties with a metal detector?

I have just ordered one. 

I own a number of properties in a historic neighborhood. It was the first neighborhood in Atlanta, where African-Americans were allowed to own properties. I also know that many people did not trust banks at the time, because they were all run by white people. 

I have 15 pieces, totalling about 2 acres , so, I think it's worth it and fun to go over everything and see what I'll find (beyond all of those damn nails and screws from renovations - lol  )