Properties in Beaver County listed on the National Register of Historic Places include Point of Beginning in Ohioville on the Pennsylvania-Ohio line and Old Economy Village in Ambridge, both in 1966; the Captain William Vicary Mansion in Freedom in 1974; Greersburg Academy in Darlington, Legion Ville near Ambridge, Fort McIntosh in Beaver, and the Senator Matthew Stanley Quay House in Beaver in 1975; the B.F. Jones Memorial Library in Aliquippa in 1978; the former William B. Dunlap Mansion in Bridgewater and Merrill Lock Number 6 in Industry in 1980; the Merrick Art Gallery in New Brighton in 1983; the Economy Historic District in Ambridge and Carnegie Free Library in Beaver Falls in 1985; the David Littell House in Hanover Township in 1986; the Raccoon Creek Recreational Demonstration Area in Hanover Township in 1987; Watts Mill Road Bridge over Little Beaver Creek in 1988; the James Beach Clow House in North Sewickley Township in 1989; the Pittsburgh and Lake Erie Passenger Station in Aliquippa in 1990; and Bridgewater Historic District and the Beaver Historic District in 1996.