View of barracks and the ammunition factory in one of the first photos of Dachau concentration camp. Dachau, Germany, March or April 1933. Photograph »

Arrival of political prisoners at the Oranienburg concentration camp. Oranienburg, Germany, 1933. Photograph »

Many of the early concentration camps were improvised. Here, roll call is held for political prisoners aboard a ship used as a floating concentration camp. Ochstumsand camp, near Bremen, Germany, 1933 or 1934. Photograph »

Official postcard for use by prisoners of the Esterwegen concentration camp. The text at the left side gives instructions and restrictions to inmates about what can be mailed and received. Germany, August 14, 1935. Photograph »

Uniformed prisoners with triangular badges are assembled under Nazi guard at the Sachenhausen concentration camp. Sachsenhausen, Germany, 1938. Photograph »

Newly arrived prisoners at the Buchenwald concentration camp. Buchenwald, Germany, 1938-1940. Photograph »

Roll call for newly arrived prisoners, mostly Jews arrested during Kristallnacht (the "Night of Broken Glass"), at the Buchenwald concentration camp. Buchenwald, Germany, 1938. Photograph »