The Temple of Poseidon stands at Cape Sounion, the southernmost tip of the Attica peninsula, some 70 kilometres southeast of Athens, on a rocky headland that falls away in cliffs to the Aegean on three sides. Raised around 444–440 BC on the site of an earlier sanctuary destroyed by the Persians, the temple was built in gleaming local white-grey marble in the Doric order and dedicated to Poseidon, god of the sea, whose realm surrounds the cape on every side. For the sailors of ancient Athens it was the last landmark of home as they set out and the first sight of it on their return, and Homer's Odyssey calls this promontory 'holy Sounion, cape of Athens.'
What survives today is one of the most romantic ruins in Greece: about fifteen of the temple's original thirty-four slender Doric columns still stand on the summit of the cape, framing the sea and the sky. The marble is the pale, weathered stone quarried nearby at Agrileza, and over the centuries visitors have left their mark on it — most famously the poet Lord Byron, who is said to have carved his name into one of the columns in the early nineteenth century and who set the cape at the heart of his verse. A short walk away lie the more fragmentary remains of the Sanctuary of Athena Sounias, a second temple that once shared the headland. But it is Poseidon's temple, poised on the cliff edge above the water, that draws travellers, and it has done so for two hundred years.
Cape Sounion is above all a place to watch the sun go down. As the classic late-afternoon excursion from Athens, the headland turns the fall of light into an event: the columns warm from white to gold to rose as the sun sinks into the Aegean, with the islands of the Saronic Gulf floating on the horizon. The site is an open cliff-top with little shade, and sunset timing shifts through the year, so the best-loved slots are the late-afternoon and early-evening hours in the warmer months. Because entry is now timed by the hour and those golden-hour slots go quickly in summer, we handle the ticketing in your own language and reserve the slot you want, so you can give your attention to the temple and the sea instead of the queue.