Acropolis. Athens. Greece. View of the six Ionic columns portico on the east side of the Erechtheion on the Acropolis summit. Built between 420 and 406 BC, the Temple was designed to incorporate a number of ancient sanctuaries including that of Athena and her olive tree and Poseidon. On the south side of the building is the famous Caryatid porch which has six sculptured graceful figures of maidens supporting the entablature. These figures are copies, five of the original six maidens are displayed in the new Acropolis museum and the sixth looted by Lord Elgin is on display in the British Museum. The Acropolis of Athens and its monuments are a UNESCO World Heritage Site.