Delphi (/'d?lfa?/ or /'d?lfi/; Greek: ?e?f??, [ðel'fi]) is famous as the ancient sanctuary that grew rich as the seat of the oracle that was consulted on important decisions throughout the ancient classical world. Moreover, it was considered as the navel (or centre) of the world by the Greeks as represented by the Omphalos. It occupies an impressive site on the south-western slope of Mount Parnassus overlooking the coastal plain to the south and the valley of Phocis. It is now an extensive archaeological site and the modern town is nearby. It is recognised by UNESCO as a World Heritage Site in having had a phenomenal influence in the Ancient world, as evidenced by the rich monuments built there by most of the important ancient Greek city-states, demonstrating their fundamental Hellenic unity.