BERLIN, GERMANY - MAY 27: Gas masks stand suspended in an exhibit at the exhibition: "The First World War, 1914-1918" ("Der Erster Weltkrieg, 1914-1918") during a press preview at the Deutsches Historisches Museum on May 27, 2014 in Berlin, Germany. The exhibition, which features over 250 exhibits organized along 14 thematic battlefield sites and other places from World War I, will be open to the public from May 29 thru November 30. Photo by Sean Gallup/Getty Images) (Photo by Sean Gallup/Getty Images)
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