The Erechtheion is an ancient Greek temple located on the Acropolis of Athens, dedicated to both Athena and Poseidon. It was constructed between 421 and 406 BCE and is known for its unique architectural design, featuring multiple levels and irregular shapes to fit the uneven terrain. The temple housed sacred relics and was a significant site for religious ceremonies. One of the most famous features of the Erechtheion is the Caryatids, six elegantly draped female figures that serve as columns on the southern porch. The temple also includes the Olive Tree of Athena, symbolizing the goddess's gift to the city. The Erechtheion remains an important example of classical Greek architecture and cultural heritage.