The Gray grist mill and Donalda cattle barn is a beautiful historical building dating from the 1830's. After nearly a century grinding flour, powered by the Don River, it was converted to a cattle barn on a "model dairy farm" owned by the Dunlop family. They had progressive ideas - the cows had steam heat, fresh air ventilation, and "soft radio music" (according to the historical plaque at the site). I'm envisioning cows dancing the Charleston. The building is shingled, except for the silo, which is covered in glazed ceramic tiles. It looks like it should be good for another couple hundred years.