A Talayotic period settlement (1000-700 B.C.) in Trebalúger was a spectacularly large talaiyot; it is 28 metres in diameter at its widest point. It has an elliptical layout and was built on a high rocky outcrop on the site of an earlier structure from the Naviforme period dating from 1350 B.C., with the bases of the pillars still preserved inside. At the front of the monument, near the entrance, you can see the remains of a ramp that led up to the top of the talaiyot. Around the outside you can see the walls of a polygonal structure, also from the Talayotic period, which has been damaged by the lime kiln built over it at a later date.
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.