and all prison functions in the building stopped in 1934. War Crimes, Departures and Transformation (20th-21st century) in October 1945, after the end World War II, the Palais of Justice courtrooms were used to try the highest French officials who had collaborated with the Nazi occupation. Those put on trial included the former prime minister Pierre Laval and Marshal Phillipe Petain. Laval was found guilty and was executed in October 1945 by a firing squad. Petain was also found guilty and sentenced to death, but due to his age and past service his sentence was reduced to imprisonment and then transfer to a hospital. He died at the age of 95 on July 23, 1951. By the 21st century, the Palace of Justice had become too small for some of its functions. In 2018, the Tribunal judiciaire de Paris, the court formerly known as the Tribunal de grande instance de Paris was moved to a modern high-rise tower, the Tribunal de Paris, by architect Renzo Piano at Batignolles, in the 17th arrondissement. The Tribunal d'instance petit (court of first instance) also moved to the new Tribunal de Paris effective January 1, 2020. The Palace of Justice today Some historic parts of the Palace were opened to the public in 1914, and in 1934 the prison of the Conciergerie was definitely closed. The lower portion of the Conciergerie became an historical heritage site, while the upper levels continued to be occupied by judicial offices. The formal entrance to the Palais de Justice is through the Cour de Mai, or "May Courtyard". The lace-ike gilded iron gateway was part of the 19th century reconstruction. Inside, most of the space is occupied by the courtrooms, legal offices, and support functions, including a large law library. Together these occupy about 4500 square meters of the building. Each day the Palais receives about thirteen thousand persons. The Cour de Cassation is one of the four courts of last resort in France. It has jurisdiction over all civil and criminal matters triable in the judicial system, and is the supreme court of appeal in these cases. It has jurisdiction to review the law, and to certify questions of law, to determine miscarriages of justice. Though the old Conciergerie prison was closed, the Palace still has three detention facilities. The "Depot", under the control of the Prefecture of Police of Paris, for those prisoners in "Garde à