Acropolis[Gr.,=high point of the city], elevated, fortified section of various ancient Greek cities. The Acropolis of Athens, a hill c.260 ft (80 m) high, with a flat oval top c.500 ft (150 m) wide and 1,150 ft (350 m) long. The Acropolis of Athens was a ceremonial site beginning in the Neolithic Period and was walled before the 6th century BCE by the Pelasgians. The area was adorned during the time of Cimon and Pericles with some of the world's greatest architectural and sculptural monuments.