The word Acropolis is derived from the Greek words akron, meaning edge, and polis, meaning city. So, in literal terms, Acropolis refers to the city on the edge. The Athenian Acropolis is situated on a hilly limestone outcropping that overlooks the city of Athens. Due to its location on the edge of a hill, it is also considered as the upper city or a citadel, which was enclosed by a herculean fortification wall.