Here's a crazy tidbit: There are some Muslim eschatologists and preachers who believe that Constantinople is coming back! Based on their interpretation of the Prophet Muhammad's ﷺ well-known prophecy regarding the conquest of Constantinople, they also believe that the Hagia Sophia will become an Orthodox church once again.
See Imam Nazar Hosein's book titled "Constantinople in the Quran": http://imranhosein.org/n/wp-content/uploads/2018/12/Constant...