The Mên-an-Tol is a small formation of standing stones in Cornwall. It consists of three upright granite stones: a round stone with its middle holed out with two standing stones to each side, in front of and behind the hole. When seen at an angle from one side, the stones form a three-dimensional '101'.
The site probably dates from the late Neolithic-early Bronze Age (approx. 2500-1500 BC) as do the other stone circles in West Penwith, and was probably used for ritual and ceremonial purposes.
The two side stones are both about 1.2 metres high. The westernmost stone was moved and brought into a straight line with the other two stones sometime after 1815. The holed stone is roughly octagonal in outline. It is 1.3 metres wide and 1.1 metres high; the circular hole is 0.5 m in diameter. The only other holed stone in Cornwall of this type is the Tolvan holed stone which can be seen in a garden near Helston.
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.