The 13th C Gothic belfry with its 12th C foundations is the old keep of the castle of the counts of Boulogne. It houses some antique furniture from the area and a beautiful stained-glass window showing Godefroy de Bouillon, a member of the house of Boulogne. From the top, there is a panoramic view over Boulogne and the region, if you can face the 183 steps.