Four-sided Hellenistic Altar, in front of the Doric Stoa. Settlement of the Hellenistic and Roman periods. Built according to the Hippodamian system (with a grid of parallel streets and residential blocks of the same size, called insulae), it spread over the middle terrace of the hill. A principal feature of the houses was the interior colonnaded courtyard with one side usually higher than the others (Rhodian peristyle). They were adorned with mosaic floors and facades with architraves and painted decoration on plaster. Among them are the remains of public baths with hot and cold chambers and hypocausts (underfloor installations for heating the rooms).