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In this photo provided by the Library of Congress, President Abraham Lincoln's funeral procession is seen along Pennsylvania Avenue, Washington, D.C.,...

In this photo provided by the Library of Congress, Abraham Lincoln is pictured in a three-quarter length portrait, seated and holding his spectacles a...

In this photo provided by the Library of Congress, Major General Nathaniel P. Banks, officer of the Federal Army, faces left for a full-length portrai...

In this photo provided by the Library of Congress, the monument erected on the battlefield of Shiloh, Murfreesboro, Tenn., 1863, is visible. (AP Photo...

In this photo provided by the Library of Congress, General Irvin McDowell, officer of the Federal Army during the Civil War, sits for a portrait some...

In this photo provided by the Library of Congress, encampments and earthworks at Fort Burnham, Va., are pictured between 1860 to 1865 during the Civil...

In this photo provided by the Library of Congress, Gen. George Custer stands for a portrait some time between 1860 to 1865. Location is unknown. (AP P...

In this photo provided by the Library of Congress, an interior view of a slave pen in Alexandria, Va., is pictured some time between 1861 to 1869. (AP...

In this photo provided by the Library of Congress, a group of African Americans on J.J. Smith's plantation, Beaufort, S.C., pose for a photograph in 1...

In this photo provided by the Library of Congress, Lt. George A. Custer of the Union Army is pictured with a dog at the Virginia Peninsula, Va., 1862,...

In this photo provided by the Library of Congress, anchored supply vessels at White House Landing, Va., are seen from a view down river, May-August 18...

In this photo provided by the Library of Congress, 20-pdr. v Parrott rifled guns of the 1st New York Battery are pictured in Richmond, Va., June 1862,...

**EDS NOTE: GRAPHIC CONTENT** In this photo provided by the Library of Congress, the bodies of dead Confederate soldiers have been gathered for burial...

In this photo provided by the Library of Congress, General Ambrose E. Burnside, officer of the Federal Army, stands with two unidentified staff office...

**EDS NOTE: GRAPHIC CONTENT** In this photo provided by the Library of Congress, a dead Confederate soldier lies in "the devil's den" in Gettysburg, P...

In this photo provided by the Library of Congress, the camp of the Tennessee Colored Battery is pictured during the Siege of Vicksburg at Johnsonville...

In this photo provided by the Library of Congress, seven African-American "contraband" teamsters dressed in old Union uniforms stand in front of a wag...

In this photo provided by the Library of Congress, a group of men pause for a photograph during the Battle of Chattanooga, September-November 1863, in...

In this photo provided by the Library of Congress, the Federal outer line of the Battle of Nashville, Civil War, is pictured on Dec. 16, 1864. (AP Pho...

In this photo provided by the Library of Congress, the monitor U.S.S. Onondaga is seen in the background, while soldiers sit in a rowboat in foregroun...

In this photo provided by the Library of Congress, the battered smokestack from C.S.S. ironclad ram Virginia II is pictured circa 1865. Location is un...

In this photo provided by the Library of Congress, the McLean House in Appomattox Court House, Va., site of the surrender of Robert E. Lee's surrender...

In this photo provided by the Library of Congress, President Abraham Lincoln's box at Ford's Theater is pictured in April 1865. This is the site of Li...

In this photo provided by the Library of Congress, two men stand beside two Confederate brass mountain howitzers in Richmond, Va., during the Civil Wa...

In this photo provided by the Library of Congress, two men are seen in the foreground of the Mills House, with adjacent ruins, in Charleston, S.C., du...

In this photo provided by the Library of Congress, chimneys standing in the burned district of Richmond, Va., during the Civil War, April 1865. (AP Ph...

In this photo provided by the Library of Congress, the interior of Fort Sumter with gabion reinforcements, Charleston, S.C., is pictured during the Ci...

In this photo provided by the Library of Congress, the destruction of Charleston, S.C., during the Civil War in April 1865, is visible through the por...

In this photo provided by the Library of Congress, the interior view of Fort Sumter in Charleston Harbor, S.C., is seen during the Civil War, April 18...

In this photo provided by the Library of Congress, the destruction in Charleston, S.C. during the Civil War, April 1865, is visible from roof of the M...

In this photo provided by the Library of Congress, John C. Fremont sits for a portrait some time between 1855 to 1865. Location is unknown. (AP Photo/...

In this photo provided by the Library of Congress, General George Henry Thomas, officer of the Federal Army during the Civil War, is seated for a port...

In this photo provided by the Library of Congress, General William Tecumseh Sherman, officer of the Federal Army during the Civil War, stands for a po...

In this photo provided by the Library of Congress, African Americans prepare cotton for the gin on Smith's plantation, Port Royal Island, S.C., in 186...

In this photo provided by the Library of Congress, the 150th Pennsylvania Infantry camp on Belle Plain, Va., is pictured in March 1862, three weeks be...

In this photo provided by the Library of Congress, the 'Matthews' or 'Stone House,' a key site in Bull Run, Va., in the First Battle of Bull Run durin...

In this photo provided by the Library of Congress, Harper's Ferry, W. Va., is pictured from a cemetery, March 1862. (AP Photo/Library of Congress)

In this photo provided by the Library of Congress, a soldier poses beside his canon at Fort Pulaski in Fort Pulaski, Ga., April 1862 during the Civil...

In this photo provided by the Library of Congress, the headquarters of Gen. George B. McClellan, Camp Winfield Scott, Yorktown, Va., is pictured durin...

In this photo provided by the Library of Congress, fugitive African Americans are fording the Rappahannock River in Virginia, August 1862, during the...

**EDS NOTE: GRAPHIC CONTENT** In this photo provided by the Library of Congress, dead Confederate soldiers lie by a fence on the Hagerstown road, Anti...

**EDS NOTE: GRAPHIC CONTENT** In this photo provided by the Library of Congress, dead soldiers lie in a ditch on the right wing where Brig. Gen. Natha...

In this photo provided by the Library of Congress, the interior of Fort Sumter showing ruins and explosion is shown, Charleston, S.C., in 1863, during...

**EDS NOTE: GRAPHIC CONTENT** In this photo provided by the Library of Congress, dead Confederate soldiers lie at the edge of the Rose Woods in Gettys...

**EDS NOTE: GRAPHIC CONTENT** In this photo provided by the Library of Congress, dead Confederate soldiers have been gathered for burial at the southw...

In this photo provided by the Library of Congress, unidentified men sit at a table at the noncommissioned officers' mess of Company D, 93rd New York I...

In this photo provided by the Library of Congress, Union soldiers are prepared for burial at Fredericksburg, Va., circa May 19 or 20, 1864, following...

In this photo provided by the Library of Congress, Union soldiers rest in trenches before the Siege of Petersburg in Petersburg, Va., Dec. 1864, durin...

In this photo provided by the Library of Congress, Civil War photographer Mathew B. Brady faces forward in a three-quarter length portrait in 1889, at...

In this photo provided by the Library of Congress, George A. Atzerodt, one of the conspirators in the assassination of President Abraham Lincoln, is p...