Revelation 18:15-19

15  The merchants of these things, which were made rich by her, shall stand afar off for the fear of her torment, weeping and wailing,

16  And saying, Alas, alas, that great city, that was clothed in fine linen, and purple, and scarlet, and decked with gold, and precious stones, and pearls!

17  For in one hour so great riches is come to nought. And every shipmaster, and all the company in ships, and sailors, and as many as trade by sea, stood afar off,

18  And cried when they saw the smoke of her burning, saying, What city is like unto this great city!

19  And they cast dust on their heads, and cried, weeping and wailing, saying, Alas, alas, that great city, wherein were made rich all that had ships in the sea by reason of her costliness! for in one hour is she made desolate.

The merchants of the world and the shipmasters stand a long ways away from her weeping over the riches they will lose. The city is clothed in the garments and jewels of religion and royalty (Purple and Scarlet). It is simply not conceivable that any existing great city in the world could qualify to fulfill these passages. This is a city not yet built.