Didyma (today Didim) was an ancient sanctuary with an important oracle site of the god Apollon. The Hellenistic temple of Apollo in Ionia is surpassed in size only by the temple of Herat in the Heraion of Samos and the temple of Artemis in Ephesus. It is one of the best preserved large buildings of antiquity.
In addition to the Temple of Apollo, there were other buildings in the sanctuary that were discovered only recently: A theatre of Roman times and the foundations of a temple, which may be an inscribed temple of Artemis.

The sanctuary is located in today's village of Didim. The ancient Didyma was located on the west coast of Asia Minor near the ancient city of Miletus, to which the distance is about 16 km as the crow flies. The natural connection between the two was the sea route. In addition, a road was built off the coast from the 6th century BC onwards. This "holy road" connected Miletus with Didyma. Its name refers to its sacral character, as it was intended for processions. The road between Miletus and Didyma also passed the port of Didyma, 3 km northwest of the oracle sanctuary, called Panormos (today Mavişehir).

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