Delphi is a 2.5 – 3 hour drive northwest of Athens on the slopes of Mt.Parnassus, a really stunning spot. The ancient Greeks believed it to be the center of the world. According to legend, Apollo killed the Python that guarded the Omphalos, or navel of the earth, and thereafter, the site was dedicated to the god. The Delphic Oracle was a priestess known as the Pythia, who channeled the words of Apollo for seekers of wisdom from near and far. Delphi was also known for the Pythian Games, similar to the original Olympic Games.
The extensive remains are mostly from the 6th-century BCE and are scattered on several terraced levels right down the side of the mountain. The small museum holds artifacts found at the site. The modern town of Delphi is right there, with lots of hotels, restaurants and shops. Staying a night instead of doing the roundtrip to Athens in one day is a good option. There are motor coach tours either way.