The Conciergerie is a former courthouse and prison in Paris, France, located on the west of the Île de la Cité, It was originally part of the former royal palace, the Palais de la Cité, which also included the Sainte-Chapelle. Two large medieval halls remain from the royal palace. During the French Revolution, 2,780 prisoners, including Marie-Antoinette, were imprisoned, tried and sentenced at the Concieregerie, then sent to different sites to be executed by the guillotine. It is now a national monument and museum.