Nuraghe Appiu archaeological park is surrounded by a suggestive and uncontaminated environment. It was probably born as anuraghe with only one tower, to which, later, other towers have been united, connected among them by corridors, outlining a quadrilobate figure.
In its simple form the nuraghe is a flat-topped conical tower built with stones of varying size laid without grout (dry walls). The masonry consists of courses of stone laid in more or less orderly fashion. In many cases the stones were laid as they were, but more often they were dressed to facilitate their laying. In the upper part of the towers, the part most exposed, the stones are usually dressed with care to ensure a perfect fit between the different elements and thus improve stability.
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.