Matilda "Tillie" Pierce Alleman was 15 at the time of the Battle of Gettysburg. Her memoir "At Gettysburg, Or What A Girl Saw And Heard Of The Battle" is one of the best-known accounts of a civilian's experience of a Civil War battle.
Lincoln's Chair from Ford's Theater, Henry Ford Museum, Dearborn, Michigan. A Sacred Relic as far as I'm concerned (along with the bed he died in and his pillow across the street from Ford theater in DC.
This is not a real portrait of Abe and Mary Todd Lincoln sitting in the Ford Theater balcony with Booth hiding behind the drapery. It is actually a photo of waxed figures in the Abraham Lincoln Museum in Springfield IL.