The Erechtheion was a temple built for Athena Polias and Poseidon-Erechtheus, as well as various other gods and heroes. The ancient wooden statue of Athena Polias probably stood in the eastern end of the building. It was one of the most sacred objects on the Acropolis. The western end of the building housed several religious cults, including one for Poseidon.

The Erechtheion is one of the strangest Greek temples in its design. It does not follow the normal rules of Greek temple building and is not symmetrical, because it includes several ancient cult sites.

The temple was built on two different levels due to the uneven land and it has two porches, one on its north and one on its east side. Attached to the south wall of the building is the famous porch of the Caryatids, who face the Parthenon and the processional way used during the Panathenaia.

The temple was built in the Ionic style.

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