Harbour street is 500 meters long and 11 metes wide. On both side of the street there were covered particos. These particos, which were reserved for pedestrians, had the function of protecting them from the bad weather and hosted shops in the inner part.

The roadway completely covered with marble, was enriched - towards the middle part - by four columns culminating in Corinthian capitals which upheld statues of the Four Evangelists.