‘It’s the best art collection no one has ever heard of,” says curator Renée Klish of the Army Art Collection. Small wonder: almost all of the 16,500-plus works are stored below ground level on 14th Street in Washington, DC, available for viewing by appointment only. A few hang in the Pentagon or occasionally go on tour, but for the most part, these striking original images of war—the brutality, the boredom, the tragedy, the humor—hang on massive sliding panels, hidden from view. One thinks of the warehouse scene in the closing frames of the film Raiders of the Lost Ark .