The Ancient City of Olba, later known as Diocaesarea, is located in the settlement of Uzuncaburc in the vicinity of Silifke, in the south of Mersin Province. The archaeological site lies on an elevated plateau about 30 km from Silifke. Today, it is one of the most notable ancient complexes of mountainous Cilicia, visited for its well-preserved ruins and open views of the surrounding plateau.

In antiquity, Olba was associated with a major religious center of the region of Cilicia Trachea. During the Hellenistic period, there was a sanctuary of Zeus here, which held great importance for the local priestly authority. In Roman times, the city was rebuilt and received the name Diocaesarea, so within the site one can see a combination of earlier traditions and Roman urban architecture.

Among the main surviving structures are a colonnaded street, monumental gates, a theater, cisterns, remains of an aqueduct, a tower, and ruins of temple buildings. Especially notable are the Temple of Zeus with its surviving columns and the ancient tower from which the modern name Uzuncaburc originated. In the surrounding area there are also ancient tombs and sections of the necropolis, adding to the understanding of life in the city beyond its central part.

This place is suitable for those interested in ancient history, archaeology, and monuments outside the main tourist routes. A visit to Olba makes it possible to see how a mountain city of the Roman era was organized and to better understand the role of the inland areas of Cilicia in the history of southern Anatolia.