From the Lincoln exhibition at the Smithsonian's Museum of American History.
p.s. Sorry for any confusion here (as noted in comment below) I was merely struck by the interesting symmetry of these two images, both taken in the Lincoln gallery of the Museum of American History. A parallel line of Lincoln protraits, contrasted with and equally parallel line comprised of the actual hoods worn by the Lincoln conspirators on the scaffold.
I'd never seen these hoods before and was unaware that they even still existed. I found this display both chilling and compelling.