Magheraghanrush Court Tomb was built c. 3000 BC. It may have first been a simple construction with U-shaped court; the east part was added later.
Local legend has it as a Giant's Grave or Druid's Altar, or the burial site of Eógan Bél (d. AD 542), King of Connacht, although the Middle Irish poem Caithréim Cellaig says he was buried on Knocknarea and reburied on an island in Lough Gill.
The tomb is very large, 30 m long. The court is oval and located in the centre with two chambers at one end and a single chamber at the other, giving it the appearance of a man from above. The central court is not a perfect oval but is crooked in the middle, indicating that there was originally one court cairn which was then added to.
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.