An Anadolu Agency team got access to the largest underground structures of Istanbul’s iconic Hagia Sophia Grand Mosque. Described as the "8th wonder of the world" by many people, Hagia Sophia's galleries, tunnels, cellars, and underground tomb structures bear witness to its majestic history. Hasan Firat Diker, an architecture and design professor at the Istanbul-based Fatih Sultan Mehmet Foundation University, documented the underground tunnels and culverts, which are 1,500 years ...