Built by the Teutonic Knights in the 14th century, the Great Mill was the largest watermill in medieval Europe and ran continuously until 1945. Its 18 pairs of millstones, powered by the Radunia Canal, ground flour for the city for over five centuries. The long red-brick building with its stepped gables is one of Gdansk's most distinctive medieval structures.
The interior now contains commercial units rather than the original machinery, but the exterior is well worth a look. The mill stands in the Old Town district, a short walk north of the main Royal Way axis, near St Catherine's Church. The millrace alongside it — part of the Radunia Canal — still flows.