The remains of the 13th-century city walls can be watched at the east side of Kiliński Street, the north side of Przekop Street, in the western facade of the granary on Wodna 3 Street, and on parcels near the castle boroughs.
There is also the part of the flanking tower in the northeast corner of Old School Square, Mazurska Tower by Drwęca occupied by a tourist information center and a PTTK branch, and also Kamienna Gate.
The city walls date back to the end of the 13th century when, after the Lithuanian invasion, the relocation of the first settlement and establishing the city on the new urbanistic plan took place. The walls are an example of medieval defensive formations typical for cities of the Chełmno Land. The brick walls were built from 1310 to 1330. Half of the century later, Mazurska and Chełmińska gates were extended and flanking towers were added. In the 19th century, when the development of weapons made defensive properties of walls irrelevant, the walls were gradually dismantled.
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