Mtskheta, located in Georgia, is an Eastern Orthodox cathedral with extremely high religious and cultural value. Built in the 4th century AD, the existing structure was constructed in the 11th century by architect Arsakidze during the reign of King Bagrat III. As a masterpiece of the early Middle Ages, it has been recognized as a World Heritage Site by UNESCO. It is the second largest church building in Georgia and one of the most important religious landmarks in the country. The architecture is based on the cross dome style, which emerged in early medieval Georgia and became the main style after Bagrat III unified Georgia.

A Orthodox cathedral located in Pskov, Russia, and also one of the oldest cathedrals in the city. The architecture can be traced back to the 12th century and was built by craftsmen in Novgorod. Its unique minimalist style and three helmet like domes make it one of Pskov's iconic buildings. Located within the Ivanovsky Monastery, opposite Balaamta on the opposite bank of the Pskov River. With a long history, it has witnessed the rich religious and cultural traditions of the Pskov region. The architectural style and decorative details reflect the exquisite craftsmanship of ancient Russian architectural art, and are important sites for studying Russian history and religious architecture.