The most interesting monuments of ChojnÃ w are prince of Legnica 's castle from the 13th century ( currently used as a museum ) , two old churches , Baszta Tkaczy ( Weavers ' Tower ) and preserved fragments of city walls . Among the interesting monuments of ChojnÃ w are the 13th century castle of the Dukes of Legnica ( currently used as a museum ) , two old churches , the Baszta Tkaczy ( Weavers ' Tower ) and preserved fragments of city walls .