Starigrad Fortress was built during the Croatian–Ottoman wars (15th century) as a primary defence against the Ottoman Empire. The precipitous fortification is sited on a 262 m ridge above the town Omiš. In the event of attack, its purpose was to provide refuge for local people and be a stronghold where they could retreat to and resist the Turks.
As the stone fort's defensive strength is derived from the elevation at which it was built, it is a rudimentary defensive structure. A two-storey square tower stands at its highest point, serving as both a lookout post and keep. A simple bastion stands at the opposite end of the fort to cover the approach path and the ridge line. It has an outer barbican to defend the fort's narrow entrance gateway and the gorge below the fort. The walls, which are about 1 m thick, are made from locally quarried limestone. They enclose an inner bailey that is separated into two distinct levels by the difference in the site's natural rock height. Access between the levels is via a small stone stairway that was once protected by a stone wall and gateway. In event of attack, the fortification's design permits the defenders to fall back to higher ground as each level falls.
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.