Overview
The Acropolis of Athens is a flat-topped rock rising about 150 metres above the Attic plain, its natural cliffs forming defences on three sides. Human occupation dates to the Neolithic, but the monuments that define the site belong chiefly to the 5th century BCE, when Athens, enriched by the Delian League and led by Pericles, embarked on a building programme under the architects Ictinus, Callicrates, Mnesicles, and the sculptor Phidias. The Propylaea (monumental gateway), Temple of Athena Nike, Erechtheion (with its Caryatid porch), and above all the Parthenon — temple of Athena Parthenos — transformed the citadel into a unified sacred landscape visible across the city.
The Parthenon (447–432 BCE) is a Doric peripteral temple of Pentelic marble housing Phidias's chryselephantine Athena; its sculptural programme (metopes, frieze, pediments) remains central to art history. The Erechtheion incorporates multiple cults, including Athena and Poseidon-Erechtheus, on uneven ground sacred in myth. Earlier Archaic temples destroyed by the Persians in 480 BCE preceded these Classical buildings; traces survive in fill and foundations.

Attica 06-13 Athens 50 View from Philopappos - Acropolis Hill | A.Savin (CC BY-SA 3.0)
"For though they were created in a short time, they were made to last for a very long time. Each work in its individual beauty was at the moment of its creation already venerable."
— Plutarch, Life of Pericles 13.5, on the Acropolis building programme (1st century CE)
In antiquity the Acropolis was primarily religious, not residential. Roman, Byzantine, Frankish, and Ottoman phases added modifications, a church inside the Parthenon, and later a gunpowder magazine — whose explosion in 1687 during the Venetian siege shattered the Parthenon. Greek independence began systematic excavations and anastylosis; the Acropolis Museum (2009) displays sculptures in climate-controlled galleries. UNESCO inscribed the site in 1987. Annual visitor figures exceed four million, making it Greece's most visited archaeological destination.