The Acropolis of Athens or Citadel of Athens is the best known acropolis (Gr. akros, akron, edge, extremity + polis, city, pl. acropoleis) in the World. Although there are many other acropoleis in Greece, the significance of the Acropolis of Athens is such that it is commonly known as The Acropolis without qualification.
The Acropolis was formally proclaimed as the preeminent monument on the European Cultural Heritage list of monuments on 26 March 2007. The Acropolis is a flat-topped rock that rises 150 There is no conclusive evidence for the existence of a Mycenean palace on top of the Athenian Acropolis. However, if there was such a palace, it seems to have been supplanted by later building activity on the Acropolis.
Not much is known as to the architectural appearance of the Acropolis until the archaic era. In the 7th and the 6th centuries BC, the site was taken over by Kylon during the failed Kylonian revolt, and twice by Pisistratus: all attempts directed at seizing political power by coups d' etat. Nevertheless, it seems that a nine-gate wall, the Enneapylon, had been built around the biggest water spring, the "Clepsydra", at the northwestern foot.