The Old Grist Mill in Sudbury, Massachusetts, was designed by Philadelphia hydraulic engineer J.B. Campbell and built under the direction of former property owner Henry Ford. Work on the mill began in 1924 and ground its first “grist” on Thanksgiving day, 1929. The mill is part of the site of the Wayside Inn, the oldest operating Inn in the country. The water-powered mill uses two separate grinding stones to produce the corn meal and wheat flour that is used in the Wayside Inn’s baked goods.