The fortifications were constructed throughout a historically long period of 15 centuries. From their different phases, we should point out three. The Byzantine period, when the eastern hill was fortified (Castel Vecchio), the early Venetian period, when the peninsula was turned into an island and the western hill was fortified (Castel Nuovo) and the late Venetian period, when the fortifications were completed, taking their actual form, in order to withstand canons and canonballs, the new, modern weapons of the time.

At this time, all buildings in front of the Old Fortress were demolished and the impressive Spianada Square was constructed, the biggest historic square of the Balkans. The actual buildings were constructed mainly during the period of the British rule (1817 - 1864).

In spite of the fact that no army was ever able to conquer it, it hosted many different flags, as a result of the changes in Europe. D' Anjoux, Byzantines, Venetians, French, Russians, British, Greeks, Italians, Germans took it or gave it, all leaving their trace , a building, a rampart, a church, a construction, making of the Old Fortress a real masterpiece of military architecture of older times, decorated with buildings until the late 19th century.

To get in, you have to go along the bridge which connects the fortress to the town, over an artificial   canal called " Contra fossa" , which is today used as an anchorage place for fishing boats .

In the beginning of the bridge, before the entrance, you will see the statue of the Field Marshal Shulenburg in the memorial   of the successful defense during the last siege of the Turks. Note that, the Corfiot people were so grateful to the Field Marshal, that this statue was created while he was still living .

Among the buildings that you eill see are the old Venetian prison (1786), the English barracks (1850), the impressive neoclassic church of Agios Georgios (1840) and the English hospital .

At the left (northern) side, a subterranean tunnel will take you to the Venetian port ("Mandraki"), which is now used by the Sailing club, and where a Restaurant and Bar functions.

At the central part of the Fortress over the church of Agios Georgio, there is also a Bar and a small Restaurant .