The Verona Arena is a Roman amphitheatre built in 1st century. It is still in use today and is internationally famous for the large-scale opera performances given there. It is one of the best preserved ancient structures of its kind. In ancient times, nearly 30,000 people was the housing capacity of the Arena.
The building itself was built in AD 30 on a site which was then beyond the city walls. The round façade of the building was originally composed of white and pink limestone from Valpolicella, but after a major earthquake in 1117, which almost completely destroyed the structure's outer ring, except for the so-called 'ala', the stone was quarried for re-use in other buildings. Nevertheless it impressed medieval visitors to the city, one of whom considered it to have been a labyrinth, without ingress or egress.
The first interventions to recover the arena's function as a theatre began during the Renaissance. Some operatic performances were later mounted in the building during the 1850s, owing to its outstanding acoustics. In 1913, operatic performances in the arena commenced in earnest due to the zeal and initiative of the Italian opera tenor Giovanni Zenatello and the impresario Ottone Rovato.
In recent times, the arena has also hosted several concerts of international rock and pop bands.
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.