Of #Gundulf's Tower#, on the north side of the choir, between the main and choir transepts, only ruins now remain, but these are older than any other part of the church's buildings still in existence above ground. The tower was certainly Gundulf's work and built before his church. The construction of the latter rendered useless two out of the four long narrow windows that had been inserted in the tower, one in each side, on the ground floor, and they were therefore blocked up. The tower, though rather dilapidated, was still almost complete at nearly the end of the last century. A view in Grose's "Antiquities," vol. iii., shows it as it was in 1781. At that time it still rose as high as the parts of the church beside it, and traces are to be seen in the print of the flying bridge that formerly connected it with the Early English turret at the north-west corner of the choir transept. There is now, however, only a mere shell of the lower part left. The walls were 6 feet thick, inclosing a space 24 feet square. In the "History and Antiquities of Rochester" (1772), we are told that there were at that time traces of one floor at a height of 20 feet, and of another 25 feet above that. The walls then rose 20 feet more, giving a total height of 65 feet. During the Early English period the north-east angle, which stands quite clear of the church, was strengthened by massive buttresses, and a story, apparently of wood, was added on projecting arches resembling machicolations. This wooden story probably formed the bell chamber; the machicolation-like supports still existed in 1781. There has been much discussion as to the original purpose of the tower. Some leading antiquaries of the eighteenth, and of the early part of this century, thought that the bridge entrance at the top was at first the only one and that the structure with its massive walls formed the cathedral treasury. It must be remembered, however, that the early English turret to which the bridge was thrown was not in existence until much later. The lower part still remaining is so dilapidated, with all its ashlar facing gone, that it seems impossible to fix the position of the original entrance. At the present day there are two entrances, one through a large opening in the north wall, the other through a doorway in the south-west corner formed by knocking out the back of an old recess.