Do you want your holiday party to be special and memorable? Booking The Cowan Historic Mill is the first step toward your next outstanding party! The Cowan Historic Mill is Acworth’s oldest commercial building. It was built by resident, John Cowan, in the late 1870’s. It began as a flourmill, and later became a tapestry mill. Since that time, it has been remodeled and reclaimed as an event venue with space for your next big holiday party!