The Agora of Thasos was the political, administrative and religious centre of the ancient city of the island and is the most important archaeological monument complex, which took its final form over many centuries. Early structures have been identified dating from the 6th century BC. This was a public square which was enclosed by colonnaded arcades, which formed the façade of public complex and stood out for the so called “Diodos ton Theoron”, which was one of the most important sites of the city bearing religious significance.
In the complex were discovered sculptures, statues and invaluable inscriptions, many of which are now in the Louvre museum in Paris.
In the northwestern part there is the sacred shrine of Thassian Agoreous Zeus with circular enclosure of marble columns and slabs of stone, also the tomb of Glaucus, the circular altar of Theagenes, who was one of the most glorious Thassian athletes, the altar of Gaios and Lefkios Caesar, the marble bow and the early Christian Basilica of Agora with dimensions that allowed a great number of believers to attend mass.
The Agora of Thassos was brought to light during the excavations conducted by the French Archaeological School that begun in 1911. The bulk excavation and revelation of the site took place from 1948 to 1955. The excavation of the French Archaeological School continues at the same place until this date.
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.