In 1913 some 50,000 veterans from both sides of the U.S. Civil War gathered at Gettysburg in Pennsylvania to commemorate. Photographers of the time were on hand to capture some fascinating and moving images, which are now preserved in the U.S. Library of Congress.

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Image: The Blue and the Gray at Gettysburg: a Union veteran and a Confederate veteran shake hands at the Assembly Tent. Courtesy of U.S. Library of Congress.