 Apart from the Onze-Lieve-Vrouwetoren, the Koppelpoort, and the "Muurhuizen" (Wall-houses), there is also the Sint-Joriskerk (Saint George's church), the canal-system with its bridges, as well as medieval and other old buildings; many are designated as national monuments.In the Middle Ages, Amersfoort was an important centre for the textile industry, and there were a large number of breweries.Jews also lived in Amersfoort in the Middle Ages, before being expelled from the province in 1546 and beginning to return to the city in 1655.