The Conciergerie is a historic building located on the Île de la Cité in Paris, France. Originally built in the late 14th century as a royal palace, it later served as a prison during the French Revolution. The structure is known for its Gothic architecture and features, including impressive vaulted ceilings and ornate stonework. Today, the Conciergerie is part of the Palais de Justice complex and is open to the public as a museum. Visitors can explore its rich history, including the cells where notable prisoners, such as Marie Antoinette, were held before their trials.