Ruins of old fortifications blend with natural limestone outcrops in what remains of the Olsztyn Castle near Częstochowa. Located in the Polish Jura Chain, which stretches from Częstochowa in the north to Kraków in the south, Olsztyn is part of a system of medieval castles known as the Eagle Nests Trail. Like many other strongholds along that trail, the Olsztyn Castle was built by King Casimir the Great in the 14th century and destroyed during the Swedish occupation in the 17th.