Sheldon stone circle lies about 200m north of a minor road at Sheldon Farm. There are six large stones still standing, plus an equally large outlier close by at the east. The circle appears to be built on a raised platform, and the outlier stands at the end of a peninsula extension of this platform. The stones do not appear to be height graded, and there is no sign of a recumbent or possible flankers, but there are the remains of what could be a ring cairn in the interior.
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.