Located at the bottom of the impasse des Ursulines, several magnificent half-timbered façades illustrate this construction technique very well. They are part of an old post office that was located in rue Saint-Jean-Baptiste. The façade was put back in its original place in the 1970s with the aim of creating an open-sky architectural museum. Not far from these half-timbered façades you can admire a fine coat of arms topped by a horn. To one side, according to local legend, the hammered stone would have borne the coat of arms of the Thurn und Taxis, a well-known family who set up a major postal service across Europe.