After World War II, this site was chosen for trials of the Nazi high command, partly for Nuremberg's symbolic role in Nazism, but chiefly because the Palace of Justice was undamaged and contained a prison block. Charges were brought both against individuals, and against entire organisations such as the SS and Gestapo. The permanent exhibition tells the story of this and subsequent trials, eg of collaborating doctors and judges, and of officers of the individual concentration camps. It shows how these trials established many present day principles of international law and morality, eg the legal concept of genocide, and the Helsinki Principles on medical experimentation. Courtroom 600, where the trials were held, is still used today for serious crimes, so it can only be visited if no trial is in progress.