The "Great Church" often refers to significant places of worship known for their architectural grandeur and historical importance. These churches typically feature intricate designs, stunning stained glass windows, and rich histories that reflect the cultural and spiritual heritage of their communities. Many are located in major cities and attract visitors for both religious and tourism purposes. One notable example is the Hagia Sophia in Istanbul, originally built as a cathedral, later converted into a mosque, and now a museum. Its massive dome and beautiful mosaics exemplify Byzantine architecture, making it a symbol of both Christian and Islamic history.