Temple of Poseidon at cape Sounion built
500 BCE.
Shown on the map at 37.650°, 24.025°.
The Temple of Poseidon is an ancient Greek temple on Cape Sounion, Greece, dedicated to the god Poseidon. There is evidence of the establishment of sanctuaries on the cape from as early as the 11th century BC. Sounion's most prominent temples, the Temple of Athena and the Temple of Poseidon, are however not believed to have been built until about 700 BC, and their kouroi (freestanding Greek statues of young men) date from about one hundred years later. The material and size of the offerings at the Temple of Poseidon indicate that it was likely frequented by members of the elite and the aristocratic class. The Greeks considered Poseidon to be the "master of the sea". Given the importance to Athens of trade by sea and the significance of its navy in its creation and survival during the 5th century, Poseidon was of a particular relevance and value to the Athenians.
Text from the Wikipedia article Temple of Poseidon, Sounion, licensed CC BY-SA 4.0.