Though Delphi is not a biblical city, this site was of great importance in antiquity. The
Seat of an important oracle and temple of Apollo at least as early as the seventh century, Delphi received pilgrims from all over Greece. She was enriched, too, as numerous city-states sent their votive gifts and erected shrines there. The Pythian Games, in honor of Apollo, were held at Delphi every four years. (Pfeiffer, The Wycliffe Historical Geography of Bible Lands).
This photo shows the theater of Delphi. At bottom center is the temple of Apollo.
Fant and Reddish point out,
When it is surrounded by blooming almond trees in the spring, Delphi is surely one of the most beautiful places in the world. The ancient Greeks agreed and described it as the center (literally, the navel, omphalos) of the world.
The Sacred Precinct of Delphi comprises, in addition to the temple of Apollo, an impressive theater, the Bouleuterion (council chamber) of the city, numerous treasuries of Greek cities that held valuable offerings to Apollo, and many monuments and altars. From the entrance, the Sacred Way leads uphill between the bases of monuments that celebrated military victories and more than twenty treasuries that held votive offerings. The Treasury of the Athenians (510 B.C.E.) has been reerected in the form of a Doric temple. The Temple of Apollo itself was originally built in the 7th century B.C.E.; it burned to the ground in 548 B.C.E. and was rebuilt in 531 B.C.E.
This later temple collapsed from an earthquake in 373 B.C.E. Only the foundations of the third temple (346–320 B.C.E.) remain today.
Here is a photo of the Sanctuary of Athena. This tholos, or rotunda, was build early 4th century BC.

Sanctuary of Athens at Delphi. Photo by By KufoletoAntonio De Lorenzo and Marina Ventayol. Wikipedia.
One very important artifact in the Delphi Museum is the Gallio inscription. Gallio is the Proconsul of Achaia before whom Paul stood for trial at Corinth as related in Acts 18:12ff. For a photo of this inscription click here.
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