Old Classroom
A recreated schoolroom inside the Ford House in Breckenridge, Colorado, can help solvers practice finding differences--13 in this puzzle--between images.
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Credit: Gates Frontiers Fund Colorado Collection within the Carol M. Highsmith Archive, Library of Congress, Prints and Photographs Division.
To view the original image: http://www.loc.gov/pictures/collection/highsm/item/2017885595/