Image of the Parthenon today, and how it probably appeared in ancient times
In the mid-5th century BC, when the Athenian Acropolis became the seat of the Delian League and Athens was the greatest cultural centre of its time, Pericles initiated an ambitious building project that lasted the entire second half of the century. The most important buildings visible on the Acropolis today—the Parthenon, the Propylaia, the Erechtheion and the temple of Athena Nike—were erected during this period. The Parthenon was built under the general supervision of the artist Phidias, who also had charge of the sculptural decoration. The architects Ictinos and Callicrates began their work in 447 BC, and the building was substantially completed by 432, but work on the decorations continued until at least 431. Some of the financial accounts for the Parthenon survive and show that the largest single expense was transporting the stone from Mount Pentelicus, about 16 kilometres (9.9 mi) from Athens, to the Acropolis. The funds were in part stolen by Pericles from the treasury of the Delian League,[50] which was moved from the Panhellenic sanctuary at Delos to the Acropolis in 454 BC.