Hagia Sophia, officially known as the Hagia Sophia Grand Mosque, is a famous cultural and historical site in Istanbul, Turkey. It started off as an Eastern Orthodox church in 537 AD, then became a Catholic church, and later a mosque. In 1935, it was turned into a museum, but in 2020, it once again became a mosque. The current structure, built by Byzantine emperor Justinian I, is considered a masterpiece of Byzantine architecture. It's been a religious and spiritual center for the Eastern Orthodox Church and has played a significant role in the history of Christianity. With its stunning design and rich history, Hagia Sophia is a must-visit destination for anyone interested in art and culture.