The sanctuary of Delphi (deriving from the Greek word "Delphis", meaning womb), where the oracle of Apollo spoke, lies in the heart of the Greek mainland. Blending harmoniously with the breathtaking landscape and charged with sacred meaning, Delphi, since the 9th century BC, was considered as one of the most famous and most prestigious religious centers, and not only. It was a metaphysical, political, commercial and a great artistic center; justifiably being characterized the "navel of the world" ("omphalos").