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. $5 for adults; $4 for seniors and children. Open for special exhibit March 4- April 16 everyday 11am-4pm. After April 16th Normal open hours are April-September, Thursday-Sunday 11am-4pm. October-November Saturday-Sunday 11am-4pm.