Be sure to visit the new Pry House Field Hospital Museum. This new museum is located in the historic Pry House which served as Union Commander General George B. McClellan's headquarters during the battle. The museum is sponsored by the National Museum of Civil War Medicine and is open daily during the summer from 11:00 a.m. to 5:00 p.m. Call the museum to confirm the hours on (301) 416-2395 or call the main Frederick museum on (301) 695-1864. A $2.00 donation is suggested.