Close to the summit of the cliffs stand two castles, overlooking the wide expanse of the Channel.  One, surrounded by embattled walls, is Pennsylvania Castle.  It was built by the grandson of the great William Penn, the founder of Pennsylvania in America, and was so called after it.  Its large windows show that it was not intended as a fortification, and, of course, a few shot from a modern gun would knock it to pieces. On the further side of a dip or valley, on the summit of a point of rock commanding a magnificent view along the coast, stands a far more ancient edifice, a tower in the shape of a pentagon, commonly said to have been built by William Rufus, and called Bow and Arrow Castle from the small circular apertures pierced in the walls for shooting arrows.  There are large brackets above them, from which were suspended planks for the protection of the garrison when hurling their missiles at the foe.