The Acropolis of Athens was transformed in the 5th century BC under the guidance of Pericles and the sculptor Pheidias into a unique monument representing the splendor of Athens' golden age. The Parthenon, Propylaia, Erechtheion, and Temple of Athena Nike were built during this period. Over subsequent centuries, the monuments suffered damage from both natural causes and human activity, including use as Christian churches, military stores, and the looting of sculptures by Lord Elgin. Today, despite damage over time, restoration efforts aim to preserve the artistic and historic value of the monuments that represent the ideals of democracy and philosophy.