The first stop of the Delphi day trip is the traditional village of Arachova. The next stop is the Archaeological Site of Delphi, which is located in the southwestern spur of Mount Parnassos. Delphi, formerly also called Pytho, is the ancient sanctuary that grew rich as the seat of Pythia, the oracle who was consulted about important decisions throughout the ancient classical world. The ancient Greeks considered the centre of the world to be in Delphi, marked by the stone monument known as the omphalos (navel). The location is recognised by UNESCO as a World Heritage Site, having had a great influence in the ancient world.