The Acropolis stands as humanity's greatest architectural achievement of the Classical Greek period, a sacred plateau in Athens' heart housing the iconic Parthenon, Erechtheion, Propylaea, and Temple of Athena Nike—masterpieces of Ancient Greek design. Constructed during Athens' cultural peak under Pericles (460-430 BCE), the Acropolis served as a religious sanctuary dedicated to Athena and symbolized democratic Athens' cultural and military power. The Parthenon's revolutionary proportions and optical refinements became foundational to Western architecture for millennia. Designated a UNESCO World Heritage Site in 1987, the Acropolis attracts approximately 4 million visitors annually and stands as the world's most recognizable symbol of ancient civilization and democracy.