The Tower Bridge, can be reached by following the panoramic walkway opened up in 1817 around the base of the Fortress. The Bridge is 236 m long and 76 m high and is supported by mighty ogival arches sitting in turn on grandiose stone piers. A road and an acquaduct built into the stone construction run along the top. There is much debate about when the Tower Bridge was built. However, most scholars agree that it was ordered by Albornoz and developed by Gattapone out and on top of an acquaduct dating back to Roman times. The Tower Bridge supposedly dates back, therefore, to the second half of the fourteenth century. Given its obvious strategic importance, the Bridge was defended by towers (hence its name) both in the Fortress and in the small Mill Fortress opposite.

The defensive wall to the north and the central window in the large wall are nineteenth-century.