The Acropolis ("high city") of Athens is an important archaeological site on a flat-topped rock rising 150m asl in central Athens. The Acropolis is surrounded by high walls and contains the ruins of several temples, of which the Parthenon and the Erechteion are the best preserved. While the Acropolis has been settled at least since the second millennium BīC, it received its current layout and structure under the leadership of Pericles between 460-430BC