3479587 Price Birch & Co Slave pen, 1850 (b/w photo); (add.info.: Price Birch & Co Slave pen at 1315 Duke St., Alexandria, VA. The three-story brick building with mansard roof was built as the residence of Robert Young, Brigadier General of the second Militia of the District of Columbia. By 1828, it was leased by Isaac Franklin and John Armfield and used as a \'Negro Jail\' or slave pen for slaves being shipped from Northern Virginia to Louisiana.); Universal History Archive/UIG; out of copyright.