Just a common temple, but a beautiful trip along the peninsula through Glifada and Vougliameni until reaching the end, where the temple stands overlooking the ocean, in a high promontory.
It's easy to book locally a trip, and it must be great by sunset.
Spend one day at Cape Sounio, it's an hour's drive south of Athens. Except for the ancient temple of Poseidon, you will have the chance to enjoy the view to the Saronic golf and Aegean sea, as well as one of the best sunsets in Greece.
One of my favorite daily excursions is to cape Sounion. You probably know that it is located at the most southern spot of the Attica. Also, it hosts the temple of Poseidon, a magnificent sample of the ancient architecture. The view from the temple is amazing. Looking south, you see the big blue of the Aegean and the first of the Cyclades islands. Looking west you see the Saronic gulf coastline and a brilliant sunset.
The archaeological area is free and open at night when the moon is full... and the mood is right! Lots of Athenians visit it then for an unforgettable experience. There is an old hotel nearby right on the beach of Sounion but there are some more in the area, especially towards Lavrion.
A couple of kilometers before Sounion lies the large, sandy beach of Legrena. Sandy outside, more rocky but interesting inside though. If you park your car there, near the abandoned --today-- hotel and walk with the sea on your left side for 5 mins, you will be rewarded with some smaller but nicer beaches.
Sounion is one of the most important sanctuaries in Attica. There's the Temple of Poseidon, the God of the Sea. It's located on a 60-metre high hill by the sea and also used to be an important landmark for ships. Sunset here is amazing, so visit in the evening if possible :)
The site was inhabited already in the prehistoric period but there is no evidence of religious practice in such an early date. 'Sounion Hiron' (sanctuary of Sounion) is first mentioned in the Odyssey, as the place where Menelaos stopped during his return from Troy to bury his helmsman, Phrontes Onetorides.
Cap Sounioun is famous for the temple on a hill and there are buses that take you there for sundowns... but I was there for swimming and there was a nice restaurant at the beach
Take a day trip to Cape Sounion to watch the sunset.
Breath-taking view and a wonderful majestic ambience fills the air.