Anatolia exhibit the traces of different cultures representing thousands of years. During the last ten centuries both the Christians and Moslems created a culture of their own together, regardless the religious differences. Among their architectural heritage, the paper, presents a summary on the historical background of Byzantine and Greek-Orthodox churches. The examples constructed during the Ottoman period are discussed with their architectural characteristics as plans, construction techniques, as well as the estimated construction dates. The paper also includes the restoration applications of three churches chosen from two different regions, and also covers the architectural and historical aspects of restoration in Turkey; as the buildings are preserved without regarding their origins, considering them all as inseperable units of the cultural heritage, not only belonging to Turkey, but accepting them as the cultural richness of the whole world.