Rose Hill Manor Park & Museums provide visitors with a look at early American life; transportation history and the agricultural history of Frederick County. Thomas Johnson, Maryland's first elected Governor, spent his retirement at Rose Hill Manor. The Children's Museum of Rose Hill Manor Park specializes in providing child friendly exhibits and programs and brings history alive for children of all ages. Reservations are required for groups of ten or more. For reservations please call 301-600-1646.  $5 for adults; $4 for seniors and children. Open Daily April-September, Monday-Saturday 11am-4pm Sunday 1-4pm Open Weekends October & November.