Ancient Olympia- First settled in 3000 BC. The site of the ancient Olympic Games, celebrated every four years by the Greeks. Olympia was situated in a valley in western Peloponnesus, through which runs the Alpheus River. It was not a town, but a sanctuary with buildings associated with games and the worship of the gods. Olympia was a national shrine of the Greeks and contained many treasures of Greek art, such as temples, monuments, altars, theaters, statues.. a true marvel.