The Temple of Poseidon, perched on the edge of Cape Sounion, has long been a welcoming sign of "home" for sailors returning to Athens. The 5th-century BC structure is dedicated to the god of the sea, and it's just a quick drive from downtown Athens. If you happen to come here at sunset, you won't be disappointed.
Home to the ancient Temple of Poseidon, Cape Sounion has attracted a steady stream of worshipers, archeologists, and tourists for over a thousand years. As the second most powerful God in Greek mythology, naturally Poseidon's temple would occupy the best real-estate outside of Athens. Today it's still some of the most sought-after land for the Greek elite to build their vacation homes away from the city. With luxury villas dotting the countryside, it's a lovely and upscale area to visit.
Make sure you're at the ruins to watch the sunset over the Aegean Sea.