Portrait of Irmgard Huber, chief nurse at the Hadamar Institute, in her office. The photograph was taken by an American military photographer on April 7, 1945. Photograph »

View of the Hadamar Institute. This photograph was taken by an American military photographer soon after the liberation. Germany, April 7, 1945. Photograph »

Exterior view of the Hadamar main building. The photograph was taken by an American military photographer soon after the liberation. Germany, April 7, 1945. Photograph »

A US Army soldier views the cemetery at the Hadamar Institute, where victims of the Nazi euthanasia program were buried in mass graves. This photograph was taken by an American military photographer soon after the liberation. Germany, April 5, 1945. Photograph »

View of the wall surrounding the cemetery of the Hadamar Institute. Jagged pieces of glass were placed on the wall to discourage observers. This photograph was taken by an American military photographer soon after the liberation of Hadamar. Germany, April 5, 1945. Photograph »

An American soldier stands guard in front of the Hadamar Institute. The photograph was taken by an American military photographer soon after the liberation. Germany, April 5, 1945. Photograph »