The turning bridge, built in 1860, is a unique structure of this kind in Poland and just one of two in Europe.
It is situated on the Łuczański Canal and was designed to facilitate the communication of the Boyen Fortress with the town. The bridge moving span, which is 20 m long, 8 m wide and weighs over 100 tons, turns to the side, rather than upwards. It has always been operated manually by just one person.