Delphi is an archaeological site in central Greece, lying along the slope of Mount Parnassus and has been a UNESCO world heritage site since 1987. In ancient times it was a major centre for worship of the Greek god Apollo and the site of the Delphic oracle, the most important oracle in ancient Greece. The area around the temple of Apollo was a panhellenic sanctuary, where every four years Greek athletes competed in the Pythian games, the precursor to the Olympic games. Near the ruins of ancient Delphi lies the temple of Athena Pronaia. The archeological finds of the Delphi site are visible in the adjacent Delphi museum.