OK Enlighten us! What is the transparent identity of Mystery Babylon?
Do you really need me to spell out to you what the Bible has already spelled out?
It is a city, not a nation (Rev. 17:18).
It is the city where the Lord was killed (Rev. 11:8 - Mark 15:22).
It is the city that is responsible for the blood of the prophets and holy people (Rev. 17:6, Rev. 18:24 - Matt. 23:29-37).
It is a city described as an adulterous woman (having previously been married and faithful, not just a simple whore). (Rev. 17:2 - Jer. 3:1-3)
There are a few other clues we could add for even more confirmation, but the above should be enough for anyone honestly looking for the answer to be satisfied.