The Erechtheion is an ancient Greek temple on the north side of the Acropolis of Athens which was dedicated to both Athena and Poseidon.
The temple as seen today was built between 421 and 406 BCE. It may have been built in honor of the legendary king Erechtheus, who is said to have been buried nearby. Erechtheus was mentioned in Homer's Iliad as a great king and ruler of Athens during the Archaic Period, and Erechtheus and the hero Erichthonius were often syncretized. It is believed to have been a replacement for the Peisistratid temple of Athena Polias destroyed by the Persians in 480 BC.
The Erechtheion underwent extensive repairs and reformation for the first time during the 1st century B.C., after its catastrophic burning by the Roman general Sulla. The intact Erechtheum was extensively described by the Roman geographer Pausanias, writing a century after it had been restored in the 1st century AD. The building was altered decisively during the early Byzantine period, when it was transformed into a church dedicated to the Theometor. With this alteration many architectural features of the ancient construction were lost, so that our knowledge of the interior arrangement of the building is limited. It became a palace under Frankish rule and the residence of the Turkish commander's harem in the Ottoman period.
In 1800 one of the caryatids and the north column of the east porch together with the overlying section of the entablature were removed by Lord Elgin in order to decorate his Scottish mansion, and were later sold to the British Museum (along with the pedimental and frieze sculpture taken from the Parthenon). During the Greek War of Independence the building was bombarded by the Ottomans and severely damaged, the ceiling of the north porch was blown up and a large section of the lateral walls of the cella was dismantled. The Erechtheum went through a period of restoration from 1977 to 1988.
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.