As Soon as the biggest cathedral in the world, the Hagia Sophia is taken into account the magnum opus of Byzantine architecture. Guests say it is a will have to-see when in Istanbul and endorse having a guided tour For more info with regards to the background of the internet https://istanbul-work80123.wikifordummies.com/8885886/how_is_wordpress_is_free_can_save_you_time_stress_and_money