The name Sounio became synonymous of wealth and power, with the glorious temple of Poseidon emerging on its high cliffs, which on the one side are bathed by the Aegean Sea and on the other side they meet the Saronic Gulf. Its waters are named after the mythical hero Aegean.
The temple was built in 444-440 BC and was part of the building program of Pericles the Athenian. It was also a trading post and a naval base of the ancient Athenians while it was connected with maintenance of warships, leaving to this day the signs of their activity visible.
The distance from Alimos marina to the cape of Sounio is only 20 nautical miles. It is an attraction for every person who visits Athens, even though it is not so close to the center. The bay below the ancient temple is used as mooring point for many sailing boats.
The ancient temple is open to the public 7 days per week (except public holidays) from 9:30 in the morning until the sunset.