The first development at Scicli was around the Castello dei tre cantoni at the top of San Matteo hill that overlooks the town. The Castello dei tre Cantoni is actually composed of two separate fortifications, the Castelluccio higher up and the Castellaccio at a lower level.
This was a defensive structure that, over the centuries, was enlarged and used first by the Arabs, then by the Normans and then later as a military outpost of the County of Modica. The current castle is dated to the 13th century although studies date its origins to the first half of the 12th century.
The Castle has a triangular tower, while to the north-east stands a large wall terminating in a quadrangular tower. The reason for having an unusual triangular tower is unknown, but thought to be symbolic (possibly related to the three points of Sicily itself) rather than a military function.
References:The ancient Argos Theater was built in 320 BC. and is located in Argos, Greece against Larissa Hill. Nearby from this site is Agora, Roman Odeon, and the Baths of Argos. The theater is one of the largest architectural developments in Greece and was renovated in ca 120 AD.
The Hellenistic theater at Argos is cut into the hillside of the Larisa, with 90 steps up a steep incline, forming a narrow rectilinear cavea. Among the largest theaters in Greece, it held about 20,000 spectators and is divided by two landings into three horizontal sections. Staircases further divide the cavea into four cunei, corresponding to the tribes of Argos A high wall was erected to prevent unauthorized access into the theatron and may have helped the acoustics, but it is said the sound quality is still very good today.
Around 120 CE, both theaters were renovated in the Roman style.