Revelation 17 is the destruction of ecclesiastical (religious) Babylon. Revelation 18 is the destruction of political-economic Babylon, the capitol of the anti-Christ. Babylon will become the financial and cultural center of the world in the last days and will be the headquarters of the antiChrist. But because of continuing idolatry and the persecution of the saints, her judgment has now fully come, fulfilling the prophecies of Isaiah and Jeremiah.