The city borders on Chełmska Hill (), a site of pagan worship in prehistory, and upon which is now built the tower "sanctuary of the covenant", which was consecrated by Pope John Paul II in 1991, and is currently a pilgrimage site. Also an observation tower is located on the hill. At the entrance to the sanctuary there is a monument dedicated to the Polish November insurgents of 1831, who, imprisoned by Prussian authorities, built a road connecting Koszalin with nearby Sianów.