About half way along the harbour rampart is the Sea Gate, the loveliest entrance to the castle of Rhodes. The opening is flanked externally and internally by two tall semicylindrical towers, with splayed base and crenellated top. Above the seaward opening is a badly damaged relief of the Virgin and Child, probably with St. John the Baptist and St. Paul on either side, while below are heraldic devices of the Order of St. John, the royal house of France and P. d’ Aubusson, and the date 1478.

Continuing northwards, there is another entrance, which was probably known as the Arnaldus Gate. The wall is then pierced by the Dockyard or Tarsana Gate and, further north, the St. Paul Gate which controlled all movement back and forth between the two harbours, the Commercial and Mandraki, and the Mole of St. Nicholas.

The Freedom Gate (Pyli Eleftherias) was opened during the Italian rule where the Simi Square is today while the medieval Cannon Gate, at the Kleovoulou Square, permits access to the fortification from the Palace. From this gate starts an oblique wall that links the Grand Masters Palace with the external rampart. Τhe St. Antony Gate, low down in this transverse wall, leads out to the city to the plain and the harbour of Mandraki. This section of the fortification owes its final form to E. d’ Amboise, who also built the beautiful and imposing d’ Amdoise Gate.

The next feature is the St. George Bastion, the earliest phase of which dates to the time to A. Fluvian when it was one of the central gates of the city, since it led directly from the countryside into the market place. P. d’ Aubusson blocked up the gateway and converted it into a simple but strong bastion in 1496. It was given the form it has today in 1521 when Ph. V. de l’ isle Adam applied the plans drawn up by the renowned engineer Basilio dalla Scuola, thus making it one of the most impregnable positions in the fortification.