The Second Doom
Commercial Babylon
Revelation 18:1-24

This chapter begins with the words "after these things".  What things?  The things recorded in the previous chapter, the destruction of mystical Babylon.  

           If she was destroyed in the previous chapter, she cannot appear in this chapter and the City described here must be a literal city called Babylon and since there is no city by that name on the earth now and hasn't been since the ancient city was destroyed, it must refer to some future city of Babylon.