Don't forget Service Photo...
http://www.servicephoto.com/hours/index.htm

For other neat things to see/places to go in Baltimore, there's the Railroad Museum (near the Edgar Allen Poe house), Druid Hill Park, Cylburn Arboretum, the Johns Hopkins University undergraduate campus, the Baltimore Museum of Art, Maryland Institute College of Art's campus (which has an excellent photography program, btw...), Greenmount Cemetery (home to many famous and infamous dead Baltimoreans, including relatives of Napoleon, John Wilkes Booth (the assassin of Abraham Lincoln), Johns Hopkins (founder of the university), and Walter Lord (author of "A Night To Remember" about the sinking of the Titanic).