One of the most important archaeological monuments in Koszalin is the Stone Circles Reserve, located in the forest between Mostowo and Grzybnica. In the Reserve, there is a cemetery established by the Scandinavian tribe of Goths, who lived in this area at the turn of the millennia of Before Christ and Anno Domini - they had their settlement in Grzybnica. Over an area of several hectares, we can find five stone circles from the 1st and 2nd centuries AD and over one hundred mounds, i.e. cremation and skeletal graves. This reserve is one of the points on the Goths Cycling Trail.