The last portrait ever taken of Abraham Lincoln, the President of the United States, before he was assassinated on April 15, 1865. Taken by photographer Alexander Gardner on February 5, 1865. (LOC)
A picture advertising a "Volunteer Refreshment Saloon," which was supported by the citizens of Philadelphia, PA. Lithograph by W. Boell, 1861. (15-M-40)
Taken in 1863, these three photographs are of Peter, a slave in Louisiana, who had scars from being whipped by an overseer. These photographs were distributed in the North throughout the war, and Peter later fought in the Union Army. (NARA)
A former slave (middle, leaning against cabin), serving as a soldier in the Army of the Potomac, at the army's winter headquarters near Fredericksburg, VA. (AP Photo/Mathew B. Brady)
The USS Essex, an ironclad gunboat that joined the US Navy in 1862. Photograph taken in March of 1863. (LOC)
"Union General Ulysses S. Grant served as Commanding General of the Army during the Civil War." (LOC)
"The camp of the Tennessee Colored Battery, pictured during the Siege of Vicksburg at Johnsonville, Tennessee, in 1864." (AP Photo/Library of Congress)
Union and Confederate soldiers dead after the Battle of Gettysburg. Photographed by Timothy H. O'Sullivan in July of 1863. (165-SB-36)
A portrait of William Tecumseh Sherman, a General in the Union Army who was best known for capturing Atlanta, Georgia, and his subsequent march, called "Sherman's March to the Sea." (Matthew Brady/NARA)
The remains of Union soldiers being picked up by African Americans after the battle at Cold Harbor, VA, in April of 1865. (LOC)