The fortified city itself consists essentially of a concentric design with two outer walls with towers and barbicans to prevent attack by siege engines. The castle itself possesses its own drawbridge and ditch leading to a central keep. The walls consist of towers built over quite a long period.3 One section is Roman and is notably different from the medieval walls with the tell-tale red brick layers and the shallow pitch terracotta tile roofs. One of these towers housed the Catholic Inquisition in the 13th Century and is still known as “The Inquisition Tower”. Today there is a museum “Musée de la Torture”, which shows some of the original torture equipment employed by the Catholic Church.
( used as subject in the BOOK (CITADEL) by Kate Mosse)