Delphi, located around 175 kilometers from Athens, is a popular archaeological site, that can also be visited during a day trip, as it is a scenic 2.5-hour drive or bus ride from Athens. Surrounded by an impressive mountain scenery, Delphi is considered as one of the most beautiful ancient sites in Greece. During ancient times it was considered the center of the known world and the holiest site in the world. It was also the site of the Delphic oracle, the most important oracle in the classical Greek world.