The Farm House, also known as the Knapp–Wilson House, is the oldest building on the campus of Iowa State University in Ames, Iowa. Now a museum open to the general public, this house was built 1861-65 as part of the model farm that eventually became Iowa State. It was designated a National Historic Landmark in 1964 for its association with agriculturist and teacher Seaman A. Knapp and with U.S. Secretary of Agriculture James Wilson, both of whom lived here while teaching at Iowa State.