The Acropolis of Athens is an ancient citadel located on a rocky outcrop above the city of Athens and contains the remains of several ancient buildings of great architectural and historical significance, the most famous being the Parthenon. The word acropolis is from the Greek words ἄκρον (akron, "highest point, extremity") and πόλις (polis, "city"). The term acropolis is generic and there are many other acropoleis in Greece. During ancient times the Acropolis of Athens was known also more properly as Cecropia, after the legendary serpent-man, Cecrops, the supposed first Athenian king.
The Acropolis is located on a flattish-topped rock that rises 150 m (490 ft) above sea level in the city of Athens, with a surface area of about 3 hectares (7.4 acres). While the earliest artifacts date to the Middle Neolithic era, there have been documented habitations in Attica from the Early Neolithic period (6th millennium BC).
The Acropolis complex consists of many works, including typical: Propylaea Gate; temple Erechtheion; Temple of Athens Nike; Phathenon temple... The large and small works at the Acropolis were built with Doric symbolism and architectural style.
The entrance to the Acropolis was a monumental gateway termed the Propylaea. To the south of the entrance is the tiny Temple of Athena Nike. At the centre of the Acropolis is the Parthenon or Temple of Athena Parthenos (Athena the Virgin). East of the entrance and north of the Parthenon is the temple known as the Erechtheum. South of the platform that forms the top of the Acropolis there are also the remains of the ancient, though often remodelled, Theatre of Dionysus. A few hundred metres away, there is the now partially reconstructed Odeon of Herodes Atticus.
The Acropolis is the place for the present generation to have the most panoramic view of a golden age of Greek civilization. In 490 BC, the Athenians laid the first stones as the foundation of the Acropolis to worship the city's guardian deity - the goddess Athena Parthenos.
The Acropolis Restoration Project began in 1975 with the goal to reverse the decay of centuries of attrition, pollution, destruction from military actions, and misguided past restorations. The project included collection and identification of all stone fragments, even small ones, from the Acropolis and its slopes and the attempt was made to restore as much as possible using reassembled original material (anastylosis), with new marble from Mount Pentelicus used sparingly. All restoration was made using titanium dowels and is designed to be completely reversible, in case future experts decide to change things. A combination of cutting-edge modern technology and extensive research and reinvention of ancient techniques were used.
A total of 2,675 tons of architectural members were restored, with 686 stones reassembled from fragments of the originals, 905 patched with new marble, and 186 parts made entirely of new marble. A total of 530 cubic meters of new Pentelic marble were used.
According to Wikipedia