To the west of the Dionysos theatre and quite close to the cliff of the Acropolis lies the Asklepieion, the sanctuary of the healing god Asklepios dated to 420 BC. Functioning pretty much as hospitals, the asklepieia were of immense importance in ancient Greece, the most popular being the Asklepieion of Epidaurus. Besides the usual facilities for sheltering the pilgrims, the core structures of the Athenian complex were the temple of the god and the enkoimeterion (dormitory). That was a large two-storey stoa for the enkoimesis of the patients, a dream-like and rather hallucinatory state of sleep induction, practised in those shrines. While in hypnotic state, the patients waited to receive a dream vision of the god who would either give medical advice or even miraculously cure them. Votive offerings that came to light from the site often depict healed body parts. Characteristic examples are on display in the Acropolis Museum.
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.