Historian Julia Werner discovered this set of photos in the Jewish Museum in Rendsburg, Germany, and they constitute one of the only visual records we have of the construction of an open-air ghetto. Taken on June 16, 1940, by German soldier Wilhelm Hansen, the 83 images (a selection of which can be seen below) track the forced movement of the Jewish population of Kutno, Poland, from their homes to the grounds of an abandoned sugar factory, where they were ordered to set up camp.

A Nazi’s Documentary Photographs of the Forced Removal of Polish Jews, 1940 Slate cagr