Hagia Sophia, officially known as the Hagia Sophia Mosque, is a significant cultural and historical site located in Istanbul, Turkey. It was originally built as a Christian church in the 6th century AD and served as the cathedra, or bishops seat, of the city. Over the centuries, it has undergone various transformations, including being converted into a mosque following the conquest of Constantinople by the Ottomans in 1453. In 1934, it was secularized and turned into a museum, and in 2020, it was reconverted into a mosque. The Hagia Sophia is renowned for its architectural grandeur and historical significance, and it is considered one of the worlds great monuments. The buildings construction and design, including its iconic dome, have captivated visitors for centuries, and it continues to be a symbol of Byzantine culture and heritage. The Hagia Sophia was designated a UNESCO World Heritage site in 1985 as part of the Historic Areas of Istanbul. It remains a popular tourist attraction and a testament to the rich history of Istanbul and the broader region.