Take a tour of Hagia Sophia in Istanbul, Turkey – part of the World’s Greatest Attractions travel video series by GeoBeats. Istanbul’s famous Hagia Sophia is a classic example of Byzantine architecture. Its uniquely constructed dome is a source of interest for many. The church served as a Christian place of worship from the year 360 until the 1300s. Under the Ottoman Empire, it was converted into a mosque. As a result, the Hagia Sophia features both Christian and Muslim religious iconography. In 1934, at the start of the Turkish Republic, it was ordered to be transformed into a museum. It is now forbidden to worship openly here. The ancient and iconic Hagia Sophia has inspired similar architecture the world over.