Six centuries of stop and start
The sons of Peisistratos began it around 520 BC and abandoned it when their rule fell. The Seleucid king Antiochus IV restarted it in 174 BC, and Hadrian finally completed it in the 2nd century AD.
Started by Athens' tyrants around 520 BC and finished by the Roman emperor Hadrian in the 2nd century AD, the Olympieion became the largest temple in Greece. Here's what you're looking at, and what to listen for among its columns.

The sons of Peisistratos began it around 520 BC and abandoned it when their rule fell. The Seleucid king Antiochus IV restarted it in 174 BC, and Hadrian finally completed it in the 2nd century AD.
Fifteen columns still stand. A sixteenth lies in pieces where a storm blew it down in 1852, and you can see how its drums were stacked.
Hadrian placed a huge gold-and-ivory statue of Zeus inside, and set up a statue of himself beside it.
About 638 years: it was begun around 520 BC and completed under Hadrian in the 2nd century AD.
Fifteen are standing, and a sixteenth, blown down in 1852, lies on the ground. The temple originally had 104.
Zeus, king of the Olympian gods.