The most famous high city in Greece is the Acropolis of Athens. The Acropolis is a flat-topped rock which rises 150 meters above sea level in the city of Athens, Greece. It was also known as Cecropia in honor of the legendary serpent-man, Kekrops, the first Athenian king. It is accessible only through the sloping ground to the west. All the other sides are overhanging or precipitous steep descends. Thanks to the strategic importance of the Acropolis, it became the first residence of the Attica sovereigns and of its tutelary divinities (statues and sacred stones). The entrance to the Acropolis was a monumental gateway called the Propylaea built by Mnesicles in 437 BC. To the left of the Propylaea is the Erechtheum with columns known as caryatids sculpted as figures of women. The Acropolis is home to three important ancient monuments -the Parthenon, Erechtheion and Temple of Athena, all of them around 2,500 years old. The most important of these and Greece's most recognisable monument, the Parthenon, named after the goddess of Athens, Athena Parthenos. Constructed between 447BC and 438BC, the Parthenon is built almost entirely from white marble and its construction was organised by the Athenian General Pericles. Behind the Parthenon is the Museum of the Acropolis which contains a number of fine sculptures. The Acropolis, as well as Athens, was almost entirely destroyed by the Persians in 479 B.C. After their victory at Salamis and Plataea, the Athenians returned to their city and they reconstructed the Acropolis. With the materials of the destroyed temples, Themistocles erected the North Wall, the East and south walls were built by Cimon, after his predecessor was banished. There are also the remains of an outdoor theatre called Theatre of Dionysus in which all the extraordinary plays of the Greek dramatists were first performed. One a few hundred yards away, there is the partially reconstructed Theatre of Herodes Atticus.