The McDonald Farm supplied stone for a monument that honors which historical figure?
McDonald Farm (Xenia, Ohio):  It has been named a historic site, largely because of a quarry on the farm, which supplied stone for the Washington Monument. Washington Monument: The Washington Monument is an obelisk on the National Mall in Washington, D.C., built to commemorate George Washington, once commander-in-chief of the Continental Army and the first President of the United States.
George Washington