Jerusalem?The Whore will be a city "known as Babylon." This is based on Revelation 17:5, which says that her name is "Babylon the Great."The phrase "Babylon the great" (Greek: Babulon a megala) occurs five times in Revelation (14:8, 16:19, 17:5, 18:2, and 18:21). Light is shed on its meaning when one notices that Babylon is referred to as "the great city" seven times in the book (16:19, 17:18, 18:10, 16, 18, 19, 21). Other than these, there is only one reference to "the great city." That passage is 11:8, which states that the bodies of God’s two witnesses "will lie in the street of the great city, which is allegorically called Sodom and Egypt, where their Lord was crucified.""The great city" is symbolically called Sodom, a reference to Jerusalem, symbolically called "Sodom" in the Old Testament (cf. Is. 1:10; Ezek. 16:1–3, 46–56). We also know Jerusalem is the "the great city" of Revelation 11:8 because the verse says it was "where [the] Lord was crucified."Revelation consistently speaks as if there were only one "great city" ("the great city"), suggesting that the great city of 11:8 is the same as the great city mentioned in the other seven texts—Babylon. Additional evidence for the identity of the two is the fact that both are symbolically named after great Old Testament enemies of the faith: Sodom, Egypt, and Babylon.This suggests that Babylon the great may be Jerusalem.http://www.catholic.com/library/Hunting_the_Whore_of_Babylon.asp
