Courtroom 600 of the Nuremberg Palace of Justice was used in 1945-46 for the International Military Tribunal’s (IMT) trial of the main war criminals. It presently has the sober appearance of a Bavarian state court as it was used as a normal high court hall from 1961 to 2020. It may now be seen as part of the Nuremberg Trials Memorial permanent exhibition.
Audioguide 600 gives a very good overview of the layout used in 1945.