The cave of Ellinokamara οn the Island of Kasos has been νisited in the course of time by travellers and archaeologists who have provided us with detailed descriptions and sketches both of the interior and of the exterior of the cave. The first sketch we have was made by L. Ross in 1843 while passing through Kasos during his travels in the Aegean archipelago. The entrance wall has been dated to the second half of the 5th century BC, regardless of the marks made by masons that he had recorded. Although we recognize the difficulty in dating the construction we cannot, of course, base ουr assumptions solely οn the manner the wall was built, since similar constructions existed during the Minoan l Mycenaean period and even later.
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.