Carn Euny is an archaeological site near Sancreed, on the Penwith peninsula in Cornwall with considerable evidence of both Iron Age and post-Iron Age settlement. Excavations on this site have shown that there was activity at Carn Euny as early as the Neolithic period. There is evidence that shows that the first timber huts there were built about 200 BC, but by the 1st century BC, these had been replaced by stone huts. The remains of these stone huts are still visible today.
Carn Euny is best known for the well-preserved state of the large fogou, an underground passageway, which is more than 20 metres long. This fogou runs just below the surface of the ground and is roofed with massive stone slabs.
The site was abandoned late in the Roman period.
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.