Waveland is a large farm located in Fauquier County’s Piedmont Valley and surrounded entirely by functioning agricultural land. The 1835 Greek Revival–style mansion originally featured a three-bay-wide, rectangular plan, until an 1859 two-bay-deep rear addition was built to make the dwelling T-shaped. John Augustine Washington III, the last member of the nation’s premier family to own Mount Vernon, bought Waveland in 1858. That same year, he turned over guardianship of Mount Vernon to the Mount Vernon Ladies’ Association, inspiring a monumental historic preservation movement. At Waveland, Washington installed a technologically-advanced water-delivery system that was supposedly modeled on one at the White House. This Fauquier County estate is located in the Carter’s Run Rural Historic District.