The ancient city was divided into two zones, namely the acropolis and the lower part on the plains and the coast. The acropolis was accessible only from the south side and it was on this area that the first nucleus of the city developed crossed by a road called Via Sacra leading to the main temples. The road began with two towers, one of which collapsed with part of the hill and the other was restored in the Byzantine era and is still visible. The lower city developed from the Samnite period and to a greater extent during the Roman age.