 The castle site was a vast almost circular "enceinte", separated from the town by a ditch, with a circular central keep and other buildings.The castle's appearance is known from several sources, notably in an engraving by Weiss that appeared in the "Alsatia Illustrata de Schoepflin", a painting by Gutzwiller from about 1844, and a sketch by Winkler dated 1883.A copy of a plan from 1766 gives a precise configuration of the site.