We love these maps, and I’m sure you guys do as well. Check this one out. It shows the layout of the city in 1857. Look at square 16, that’s where Camden Yards sits today.
Copyright statement on map: “Entered according to Act of Congress in the year 1855 by J. H. Colton & Co. in the Clerk’s Office of the District Court of the United States for the Southern District of New York.” On verso: “The District of Columbia”, text on three columns.