Photo Credits
Top Row, Left to Right: Medal of Honor Museum (Medal of Honor Museum Foundation); Seminary Ridge Museum (Ron Cogswell / Foter.com / CC BY); Antietam National Battlefield (National Park Service); Gettysburg Address Gallery at Gettysburg National Military Park Museum & Visitor Center (Bill Dowling for the Gettysburg Foundation); Andy Warhol Museum (glindsay65 / Foter.com / CC BY-NC-SA); Gettysburg National Military Park Museum & Visitor Center (Bill Dowling for the Gettysburg Foundation)
Middle Row, Left to Right: Old Fort Erie/Niagara Parks (bill_canada / Foter.com / CC BY-NC); American Civil War Center at Historic Tredegar (theqspeaks / Foter.com / CC BY-NC-SA); Capitol at Colonial Williamsburg (alykat / Foter.com / CC BY-NC); Herbert Hoover Presidential Library and Museum (J. Stephen Conn / Foter.com / CC BY-NC)
Bottom Row, Left to Right: Carnegie Science Center (Photomatt28 / Foter.com / CC BY-NC-ND); Cincinnati Museum Center (wallyg / Foter.com / CC BY-NC-ND); John Sutton Hall at Indiana University of Pennsylvania (Canadian2006 / Foter.com / CC BY-SA); Bruton Heights School Education Center, Colonial Williamsburg (William & Mary Law Library / Foter.com / CC BY-NC-ND)