Rose Hill Manor was built 1789-1792 by the daughter and son-in-law of Governor Thomas Johnson, a close friend and associate of George Washington. Johnson lived at Rose Hill during the last years of his life.
Frederick County purchased the property for a county park in 1968 and created the first rural hands-on history museum in the United States designed for elementary school-aged children. The 43-acre park includes a Children's Museum, Carriage Museum, and Farm Museum that focus on 19th century life.
Children are able to play with early American toys and learn about tools of the era. The Park also offers annual spring and fall festivals featuring home style foods, steam engine demonstrations, farm animals, hay rides, music, antique tractor pulls, and much more.