The is located on the south side of the erectheon. this structure was built by the greeks during the period.

The Parthenon is located on the south side of the Erectheon. This structure was build by the Greeks during the Athenian Empire period. The former temple was dedicated to the Greek goddess, Athena, whom the people of Athens considered as a patron.

What i think is that it adds loudness for preachers/church choirs. it is also able to hold up a lot of weight without pillars. : )) idek tho

Answer(simplify painting);