Re: Babylon.
Revelation 16:19 . . . and the cities of the nations fell: and great Babylon came in remembrance before God, to give unto her the cup of the wine of the fierceness of his wrath.
Revelation's symbolic, great "Babylon" (Revelation chapters 17-18) represents all of fallen mankind's corrupt political (Revelation 17:18), economic (Revelation 18:11), and religious (Revelation 18:24) systems throughout the earth (Revelation 18:3) and throughout history (Revelation 17:9-10). The ten kings of the empire of the future Antichrist (the individual-man aspect of Revelation's "beast") will destroy with fire what Revelation's "Babylon" represents (Revelation 17:16-17) when they destroy the cities of the nations (Revelation 16:19), probably with nukes (and probably with Fission-Fusion-Fission, "FFF", or "666", nukes, "F" representing the number 6 in English gematria), at the time of the future, seventh vial (Revelation 16:17,19), which will be the final event (Revelation 16:17) of the future Tribulation of Revelation chapters 6 to 18 and Matthew 24, right before Jesus Christ's future, Second Coming (Revelation 19:2 to 20:6, Matthew 24:29-31). The ten kings of the future Antichrist's empire could destroy the cities of the nations under the direction of Lucifer/Satan (Isaiah 14:17,12), who could want to leave only a literal "scorched earth" for Jesus to return to.
Near the very end of the future Tribulation, Lucifer (employing the ancient lies of Gnosticism) could say to the Antichrist and his ten kings something like: "Our great battle against the evil, tyrant god YHWH is about to begin [Revelation 16:14, Revelation 19:19], a battle which we will win, and so we will be able to escape YHWH's prison house, this material universe, and return to the wholly-spiritual Pleroma [i.e. Heaven]. So let us now destroy this prison cell, this foul planet, and let us, as it were, burn up all of the gewgaws which we have hung upon our cell walls. Let us burn up all of our great cities, all of our magnificent systems. Let us break all of our chains of attachment to this vile, physical realm, that we might more freely ascend back to our rightful place in the Pleroma [cf. Isaiah 14:13-14]".
Of course this will be a lie. For at His Second Coming, Jesus Christ (who is YHWH: John 10:30, Zechariah 14:3-4) will completely defeat all of the armies of the world, arrayed against YHWH (Revelation 16:14, Revelation 19:19-21). And Jesus will have Lucifer bound in the Bottomless Pit for 1,000 years (Revelation 20:1-6, Isaiah 14:15), a time period commonly called the Millennium. During that time, Jesus will restore ruined parts of the earth and make them like the Garden of Eden (Ezekiel 36:35, Isaiah 51:3). And after the Millennium and subsequent events (Revelation 20:7-15), God will create a New Heaven and a New Earth (Revelation 21:1), as in a new atmosphere (first heaven) and a new surface for the earth. And then God will descend from the third heaven in the literal city of New Jerusalem to live with Christians on the New Earth (Revelation 21:2-4).