Abraham Lincoln (in the center) at the dedication of the Soldiers’ National Cemetery in Gettysburg, Pennsylvania, on November 19, 1863. To Lincoln’s left is bodyguard Ward Hill Lamon. To his far left is Governor Andrew G. Curtin of Pennsylvania. The photograph is estimated to have been taken at about noontime, just after Lincoln arrived, before Edward Everett’s arrival and about three hours before Lincoln gave his famous Gettysburg Address. Josephine Cobb first found Lincoln’s face while working with a glass plate negative at the National Archives in 1952. (Source: NARA, Rare Photo of Lincoln at Gettysburg, http://blogs.archives.gov/prologue/?p=2564)