Photography has long played an instrumental role in preserving moments — some mundane, some good, and others downright horrific. A photo album from Auschwitz fits squarely in the latter group, although not in the way one might expect. One photo shows a group of women smiling and eating blueberries, while others show German SS officers chatting and smiling. The photo album was plucked from a trash bin in a German apartment by a United States counterintelligence officer in 1946 while he was hunting Nazi war criminals. He held onto it for decades before sending it anonymously to Rebecca Erbelding, a...