The Parthenon is the centrepiece of a 5th-century-BCE building campaign on the Acropolis in Athens. Constructed during the High Classical period, it is generally considered to be the culmination of the development of the Doric order, the simplest of the three Classical Greek architectural orders. The temple’s harmonic proportions, precise construction, and lifelike sculptures have been celebrated and emulated for thousands of years. The Parthenon is often regarded as a monument to democracy, which was founded in Athens during this period, as well as a tribute to the Athenians’ victory in the Greco-Persian Wars (492–449 BCE).