You say “Was “Babylon The Great” a Symbolic Name for Jerusalem?” I don’t think so because Jerusalem is on the mountain of God (singular) and Babylon the Great is interpreted by the Angel to be on seven mountains. Also Jerusalem has a future and Babylon The Great does not.
Some scriptural support for your opinions would be helpful. For example, the "seven mountains" which the woman sits upon, also represent the beast, which carrieth the woman:
"And here is the mind which hath wisdom. The seven heads are seven mountains, on which the woman sitteth. And there are seven kings: five are fallen, and one is, and the other is not yet come; and when he cometh, he must continue a short space." (Rev 17:9-10 KJV)
"And the angel said unto me, Wherefore didst thou marvel? I will tell thee the mystery of the woman, and of the beast that carrieth her, which hath the seven heads and ten horns. " (Rev 17:7 KJV)
In the Revelation the beast (Roman Empire) supported (carried) the woman (Jerusalem.) In real life the Roman Empire allowed Jerusalem to be mostly autonomous, even keeping most of her own laws; that is until Jerusalem rebelled. Then the "ten horns of the beast" destroyed Jerusalem and made her desolate.
I haven't fully researched the ten horns; but they appear to be either the governors of ten Roman provinces, or ten Roman legions. I lean toward the legions since they actually destroyed Jerusalem and made her desolate. There are others who believe they represent the ten provinces from which the legions were sent. Either choice is suitable for fulfillment.
BTW, heavenly New Jerusalem, which is also called the Church, sits on the mountain of God, which is called mount Sion. This is the best reference:
"But ye are come unto mount Sion, and unto the city of the living God, the heavenly Jerusalem, and to an innumerable company of angels, To the general assembly and church of the firstborn, which are written in heaven, and to God the Judge of all, and to the spirits of just men made perfect, And to Jesus the mediator of the new covenant…" (Heb 12:22-24 KJV)
It is the same as this one in the old testament:
"But in the last days it shall come to pass, that the mountain of the house of the Lord shall be established in the top of the mountains, and it shall be exalted above the hills; and people shall flow unto it. And many nations shall come, and say, Come, and let us go up to the mountain of the Lord, and to the house of the God of Jacob; and he will teach us of his ways, and we will walk in his paths: for the law shall go forth of Zion, and the word of the Lord from Jerusalem." (Mic 4:1-2 KJV)
It is always important to understand that the throne of the Lord is in heaven, as David explained in multiple ways, with this one the most to the point:
"The Lord is in his holy temple, the Lord's throne is in heaven . . ." (Ps 11:4 KJV)
As mentioned in the original post, Ezekiel 16:55 is an important prophecy regarding the future of earthly Jerusalem.
Philip