CORNWALL, Vt. (WCAX) – A rare piece of Vermont’s industrial history is for sale in Cornwall. Barbara Harding and her husband Rusty own the building, which is on the National Register of Historic Places. “We’re in the old stone blacksmith shop in Cornwall, Vermont,” said Barbara Harding. “The equipment in here has always been in a working blacksmith shop.”Inside, the tools of the trade remain intact. “Just to find it was in my DNA — of course I wanted to have a blacksmith shop,” she said.