The railroad spike is my favorite. It was the from the Alabama to Tennesse Railroad that was in operation during the Civil War. Also the horse bit and ring was pretty cool. The big piece looks to be some sort of shotgun stove door. (Not sure, just a guess)
Thanks. I found an old sewing machine within 20 feet of this stuff yesterday. There was a layer of brick about 12 inches down and all this stuff was on top of the brick. Foundation maybe? The sewing machine was produced from 1886-1902.