
Gen. John F. Hartranft reading the death warrant to the four condemned Lincoln assassination conspirators (Mrs. Surratt, Payne, Herold, Atzerodt) on the scaffold at Fort McNair, Washington. July 7, 1865. View full size. Photograph by Alexander Gardner. More execution photos at GhostCowboy.
A photograph taken after the hanging has been on display in the basement bar of the Officer's Club at Ft McNair -- as I recall, in the alcove outside the restrooms.
Have you ever checked out the Prints and Photographs webpage of the Library of Congress? It has thos of photos like these, and quite a few of Atlanta after Sherman.
[That's where this is from - Dave]