We go to Delphi, about two hours far from Athens, to see the ancient temple of Apollon.
This is the place where the Pythia was telling an oracle.
 

The Pythia was a young priestess who, once a year, was going into a trance to give an oracle.
Her tellings were incomprehensible, so the priest of Delphi had to give an interpretation out of them.
The Pythia was chosen by those among the poor population : she had to be legally born, virgin,
raise up and dress up with modesty, to approach god with an untouched soul.