Guebwiller (pop. 11,883), situated at the mouth of the Lauch valley, known as Florival ("Valley of Flowers"), developed in the eighth century around a grange belonging to Murbach Abbey. The Romanesque and Gothic church of St-Léger, which dates from the Hohenstaufen period, has fine sculpture on the central doorway. The church of Notre-Dame (18th
C) is one of the few Baroque churches in Alsace and has fine carved woodwork. The Dominican church (14th C) has a cycle of frescoes, and there is a museum in the choir. The atomic physicist Alfred Kastler (Nobel Prize 1966) was born in Guebwiller.