Don't listen to the tale that Charlemagne used to lock up flea-ridden dogs here and pay a visit to the Tour aux Puces (Flea Tower). The Thionville Regional Museum charts the history of the area in five steps from the Palaeolithic to the Late Middle Ages (in particular, recollection of sieges suffered by this town, that must have been really coveted since it was besieged in 1558, 1639, 1643, 1792, 1814-1815 and 1870). Fine Gallo-Roman section and major collection of Late Medieval stone carvings.