Once home to Duke Godefroy de Bouillon, this massive, sprawling castle is the town's dramatic centerpiece, floodlit every night during summer months. The worthy de Bouillon actually put the castle in hock in order to raise funds for his great venture, the First Crusade. The mortgaged castle passed by default into the hands of the prince-bishops of Liège, who continued to hold it for 6 centuries. After the 15th century, it was conquered and reconquered several times, as local rulers and invading forces fought over this strategic spot. Within the castle's thick walls, life during its turbulent history will come alive as you walk through the ruins and visit the old prisons and gallows and the so-called Hall of Justice.