The town walls stretch along Wąska, Kręta, Kozia and Łukowa Streets. Baszta Kaszana [the Groats Tower] is located in the south-western part of the walls at the intersection of Ignacego Daszyńskiego Street with Wąska Street.

The beginning of building the town walls was after Trzebiatów was granted municipal rights on 6 May 1277. Trzebiatów received privileges such as exclusive use of the now defunct port in Regoujście, the possibility of free navigation on the Rega and the right to fortify the town. They walls were built from the first half of the fourteenth to the first half of the fifteenth century. They were made of bricks and on foundations of boulders. There were also towers within them. Some of them were round, some square and possibly half-open. A few gates, non-existent now, guarded the entrance to the town. The town was also protected by the Młynówka and the Rega Rivers. Today, the outline the whole defence system of Trzebiatów is very clear. The section in the north-eastern part of the Old Town has not survived. The preserved sections are in different states. Some of them were deliberately reduced, others were adapted to current needs, and some suffered during the widening of the road. The most interesting building in the defence system of Trzebiatów is the gunpowder tower, known today as Baszta Kaszana [the Groats Tower]. It is a cylindrical tower with a diameter of 4 metres. The brick tower is 14 metres high and is covers by a pyramidal roof. It was created along with the adjacent sections of walls at the turn of the thirteenth century. In addition to the defensive-guard feature, it was also a store of gunpowder. The current common name derives from the legend, according to which, the town was besieged by the army of Gryfice in the fifteenth century. One of the guards performing guard duty is said to have dropped a bowl of porridge from the tower, which broke on the head of one of the besieging soldiers, thereby thwarting the concealed attack. With reference to the legend during the summer at the foot of the pasha held 'the Day of Porridge' is now held near the tower in the summer as a reference to the legend. The tower is open to the public (after a prior contact).