This drawing was untitled by Whistler, perhaps because it depicts one of the most famous spots on the Rhine: on a rocky little island south of Caub, in the middle of the river, rises the Pfalz, a curious old building with a pentagonal tower covered with an unsightly roof, numerous turrets and jutting corners, which is small, can barely be made out in the drawing. To the left a large baroque building hugs the bluffs.