Before leaving the Acropolis, make sure to visit the archeological museum. The institution contains more than 3,000 artifacts displayed on three floors. The relicts reflect over 2,500 years of Athenian life, culture and religion. Before entering the Acropolis Museum, you will be greeted by the Owl of Athena. The three foot marble statue dates from the 5th century BC. The sacred owl was a constant companion of the virgin goddess and came to symbolize her infinite wisdom, judgement and insight. The Athenian Owl was the first double-sided coin minted over 2,400 years ago. It gave rise to the expression heads (Athena) or tails (her owl). The owl is also the symbol of Athens.