Arsenal Penitentiary (original) (raw)

The Arsenal Penitentiary was a penal institution in Washington, D. C. used as a military prison during the American Civil War, currently located inside Fort Lesley J. McNair. Four Lincoln assassination conspirators, David Herold, Lewis Powell, George Atzerodt, and Mary Surratt were executed on the grounds of the Arsenal Penitentiary on July 7, 1865.