Smith's Castle, built in 1678, is a house museum at 55 Richard Smith Drive, near Wickford, a village in North Kingstown, Rhode Island, United States. Smith's Castle is one of the oldest houses in the state. It was designated a National Historic Landmark in 1993 as Cocumscussoc Archeological Site, due to the artifacts and information digs in the vicinity have yielded. It is located just off U.S. 1.