Slave pen, Alexandria, Va.
1 photograph : albumen print ; mount 9 x 17 cm (stereograph format) | Stereograph shows the interior of a Union military prison; prior to its capture by the Union Army in 1861, the facility had been used by Price, Birch & Co. slave dealership to hold slaves before they auctioned. (Source: The Center for Civil War Photography, http://www.civilwarphotography.org/index.php/3-d-photographs-exhibit/70)
Brady's National Photographic Portrait Galleries - E. & H.T. Anthony (Firm)