The first mention of the Słupsk Gate originates from 1458. It was driven by travelers arriving on the main transport route from the north. At present, the five-storey brick-faced building is one of the two preserved fragments of the medieval fortifications, erected at the turn of the 13th and 14th centuries, next to the twin gates of Koszalin.
The Slupsk Gate, like its twin, is in the lower storey with a crooked passage and a hip roof which, after dismantling the escalators at the turn of the 18th and 19th centuries, was replaced by the original gable roof. The façade of the four upper floors will fragment the slender blends. The current window openings have been reworked by former guns. In the walls visible beads - rectangular openings on horizontal beams of scaffolding, typical of medieval buildings.
In 1816 the Słupsk Gate was adapted for military workshops and later served as a warehouse. From this period, a wooden wheel for pulling loads on ropes has been preserved. After the Second World War, the building was used by the Polish Scouting Association, then housing estates and the seat of the Association of Affiliated Cities Sławno - Rinteln. Currently the object is empty.