The tower was rebuilt, and in the middle of the thirteenth century the mound was enlarged and the wooden watch-tower gave place to the stone keep. The castle area was walled in during the Edwardian period, the principal entrance with its flanking towers--now removed--faced Castle Mills Bridge. The keep has a quatrefoil plan. Corbelled-out turrets fill three angles, whilst the fourth is occupied by a rectangular gateway with the chapel above. The royal arms and those of Clifford were placed above the entrance during the seventeenth century; and the keep became known as Clifford’s Tower. The keep owes the ruined condition of its interior to a fire which broke out while it was used as a powder magazine. The military architecture of York, whilst giving an idea of strength and power to the city, adds greatly to its picturesqueness. The line of embattled walls is agreeably broken by buttresses and mural towers, whilst the stately gatehouses set along the line of fortification give a sense of dignity, at the same time reflecting the sturdy independence of the men of York. The streets are generally termed “gates”, the gatehouses “bars”, and the city walls “bar walls”. Such names as Blossom Street, Nunnery Lane, and Bridge Street are only modern substitutes for Ploxamgate, Baggergate, and Briggate. The “gates” of York often confuse visitors. A revising barrister once excused himself for being late in court by saying that he had lost his way and at last found himself in “Bootham-gate-street!” The street referred to is simply named Bootham. The streets are narrow and wind in all directions. “What narrow streets!” exclaimed Sidney Smith to one of the city tradesmen. “There is scarcely room for two carriages to pass.” “Not room!” was the indignant reply. “There’s plenty of room, sir, and two inches to spare.” The city is pleasantly situated on slightly elevated ground in the midst of a plain. Through it flows the Ouse, which is crossed by three bridges. The central one--Ouse Bridge--is of stone and consists of three elliptical arches. The other two are of iron and have quatrefoil parapets. A view of Lendal Bridge shows the old water towers. The bridge is of a single span, and on the apex of the arch the Queen-mother, Alexandra, is depicted as an angel, holding the shield of St. George. Other shields, on the parapet, bear the arms of Plantagenet England, the See of York, and the White Rose. On either side charming views present themselves. On the left by the side of the river is the Esplanade, backed by St. Mary’s Abbey Close, in which are the ruins of the Abbey Church. Towards the right is a beautiful view of the city. Rising from the riverside are the stone buildings of the Post Office, Council Chamber, and the ancient Guildhall, while beyond are seen the towers and spires of the city churches. Skeldergate Bridge consists of central and side arches, and has its parapet adorned with the Lily of France and the Sun of York.