Crowds surround Lincoln (hat off) at the cemetery in Gettysburg on November 19, 1863 before his speech in this only known photo of Lincoln at the event

CREDIT: "The Only Known Photograph Of President Lincoln at the dedication of the Civil War cemetery at Gettysburg, Pennsylvania, November 19, 1863." November 19, 1863. Copy prints. [Courtesy of Elizabeth L. Hill, Chief, Still Picture Branch, National Archives, and staff. Interpretive Programs Office]. The Gettysburg Address: Photographs, Library of Congress.