In the Book of Revelation Chapter 18 we read about the coming judgment of a nation/kingdom/people referred to as Mystery Babylon the Great.
Here are those beginning verses,

2. And he cried mightily with a strong voice, saying, Babylon the great is fallen, is fallen, and is become the habitation of devils, and the hold of every foul spirit, and a cage of every unclean and hateful bird.
3. For all nations have drunk of the wine of the wrath of her fornication, and the kings of the earth have committed fornication with her, and the merchants of the earth are waxed rich through the abundance of her delicacies.
4. And I heard another voice from heaven, saying, Come out of her, my people, that ye be not partakers of her sins, and that ye receive not of her plagues.
5. For her sins have reached unto heaven, and God hath remembered her iniquities.

This begins with the announcement that Babylon has fallen. This fallen state happened because of their sins. We read further about that fallen state; it's become a habitation of devils, I would assume literally and metaphorically. The cultural social cohesion of this place collapsing into literal evil. 

We read it becomes a home to every foul spirit, again literal and metaphorical in nature. These foul spirits are a reflection of the hearts of those living there; anger, deceit, bitterness, malice, theft, lies, murders, adulteries and sexual abominations, all of the vices  of wickedness  manifesting themselves in its cultural and social collapse.

This wickedness doesn't remain localized or regional but spreads outward across the borders to reach all the world. We read that the kings or rulers of nations committed fornication with this nation, again literal and metaphorical. Through lies and deceit rulers and merchants of the world became rich from the abundance of this nation's delicacies and merchandise. 

International trade is one of the hallmarks in identifying who this Mystery Babylon is. Not only trade but the other identifiers, the public evil of this place as well as its abundance of goods and services, its dealing in pleasures, both sexual and non-sexual. 

Then in verse 4 we read "And I heard another voice from heaven, saying, Come out of her, my people, that ye be not partakers of her sins, and that ye receive not of her plagues."
Here we can see that believers and those of faith do indeed reside in this place. In what state I'm not sure, but reflecting on the cultural and social conditions that exists one would assume the faithful are not in a very amicable environment where they can worship freely.
Believers are told to leave, to flee from this nation because judgment and plagues are coming.

In our day, today, in my mind there's only one nation on earth that can even come close to matching the descriptions defining Mystery Babylon and that is the United States.
This country has collapsed, both spiritually, culturally, and socially, matching the wickedness which describes Mystery Babylon.
Our political and economic situations reflecting similar relationships describing Mystery Babylon. Our major exports are dollars and pornography. Money and sex are two main features of America’s  modern exceptionalism which are also highlighted in Mystery Babylon.
All of those vices mentioned in Scripture about Mystery Babylon are reflected in American culture and exported around the world.

Those few faithful remaining in this place are called to leave, I wonder how many will heed  that call?

The fallen state isn't an overnight phenomenon, it takes some time but when the cup is full judgment is issued and no time will be left.
I do pray that the Spirit will give whomever this foreshadowing, that judgment is coming, that there is a call going out. That call maybe faint right now for some, but that call will continue to become louder as  more eyes and hearts are opened.