Koło Castle - a Gothic castle, which according to Jan Długosz was raised by Casimir III the Great before the year of 1362 (when Koło received its town rights). The castle secured the route from Greater Poland to Łęczyca, in the lowlands of the River Warta. The castle is located on an artificial hill on a meander of the River Warta. During the raising of the castle, the river had a number of tributaries in the area, which were important for the castle’s strategic location.