The Tower, as has already been explained, was originally a sort of fortress, or castle, built on the bank of the river, below the city, to defend it from any enemy that might attempt to come up to it by ships from the sea. The space enclosed by the walls was very large; and as in modern times many new buildings and ranges of buildings have been erected within, with streets and courts between them, the place has now the appearance of being a little town enclosed by walls, and surrounded by a ditch with bridges, and standing in the midst of a _large_ town. Rollo and Mr. George passed over the ditch that surrounded the Tower by means of a drawbridge. Before they entered the gateway, however, they were conducted to a small building which stood near it, where they obtained a ticket to view the Tower, and where, also, they were required to leave their umbrella. This room was a sort of refreshment room; and as they were told that they must wait here a few minutes till a party was formed, they occupied the time by taking a luncheon. Their luncheon consisted of a ham and veal pie, and a good drink for each of ginger beer. At length, several other people having come in, a portly-looking man, dressed in a very gay uniform, and wearing on his head a black velvet hat adorned with a sort of wreath made of blue and white ribbons, took them in charge to lead them about the Tower. This man belonged to a body that is called the Yeomen of the Guard. The dress which he wore was their uniform. He wore various badges and decorations besides his uniform. One of them was a medal that was given to him in honor of his having been a soldier at the battle of Waterloo. Under the charge of this guide, the party, which consisted now of eight or ten persons, began to make the tour. They passed through various little courts and streets, which were sometimes bordered by ranges of buildings, and sometimes by castellated walls, with sentinels on duty, marching slowly back and forth along the parapet. At length their gay-looking guide led the party through a door which opened into a very long and narrow hall, on one side of which there was arranged a row of effigies of horses, splendidly caparisoned, and mounted with the figures of the kings of England upon them in polished armor of steel. The gay trappings of the horses, and the glittering splendor of the breast-plates, and greaves, and helmets, and swords of the men, gave to the whole spectacle a very splendid effect. The guide walked along slowly in front of this row of effigies, informing the party as he went along of the names of the various monarchs who were represented, and describing the kind of armor which they severally wore.