In this Tuesday, April 2, 2013 photo filmmaker Matthew Nash displays a 

In this Tuesday, April 2, 2013 photo filmmaker Matthew Nash displays a World War II era photo of his grandfather U.S. Army medic Donald Johnson, while standing in front of a projected image of a boy in a WWII Nazi concentration camp at Nash's Boston home. The photo of the boy was taken by Johnson at what is believed to be the Mauthausen concentration camp. Nash's discovery of photographs by his grandfather led him to create a documentary about the liberation of the Ohrdruf concentration camp in Germany, the first that the Americans found. (AP Photo/Steven Senne)
Associated Press
In this Tuesday, April 2, 2013 photo filmmaker Matthew Nash displays a World War II era photo of his grandfather U.S. Army medic Donald Johnson, while standing in front of a projected image of a boy in a WWII Nazi concentration camp at Nash's Boston home. The photo of the boy was taken by Johnson at what is believed to be the Mauthausen concentration camp. Nash's discovery of photographs by his grandfather led him to create a documentary about the liberation of the Ohrdruf concentration camp in Germany, the first that the Americans found. (AP Photo/Steven Senne)
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