The City Walls – erected at the beginning of the 19th century, with 5 gates: The Water Gate, Toruń Gate, Side Gate, Łasin Gate, and the Castle Gate, which was connected to the castle buildings. Ten towers were built in the walls. Through the ages, the walls were systematically expanded and fortified. At the end of the 19th century they were partially dismantled due to the expansion of the city. The south-east corner was preserved, together with the lower part of the keep and the Water Tower which was supplied by the Trynka Canal (which presently runs underground).