The Cyrus McCormick Farm and Workshop is on the family farm of inventor Cyrus Hall McCormick known as Walnut Grove. Cyrus Hall McCormick improved and patented the mechanical reaper, which eventually led to the creation of the combine harvester. The farm is near Steele's Tavern and Raphine, close to the northern border of Rockbridge and Augusta counties in the U.S. state of Virginia, and is currently a museum run by the Virginia Agricultural Experimental Station of Virginia Tech. The museum has free admission and covers 5 acres (2.0 ha) of the initial 532-acre (215.3 ha) farm.