Just to keep the language consistent:
And a mighty angel took up a stone like a great millstone, and cast
it into the sea, saying,
Thus with violence shall that great city Babylon be thrown down, and shall be found no more at all.
Revelation 18:21 (KJV)
1 And Jesus went out, and departed from the temple: and his disciples came to
him for to shew him the buildings of the temple.
2 And Jesus said unto them, See ye not all these things? verily I say unto you,
There shall not be left here one stone upon another, that shall not be thrown down. Matthew 24:1-2 (KJV)
34 Wherefore,
behold, I send unto you prophets, and wise men, and scribes: and some of them ye shall kill and crucify; and some of them shall ye scourge in your synagogues, and persecute them from city to city: 35 That upon you may come all the righteous blood shed upon the earth, from the blood of righteous Abel unto the blood of Zacharias son of Barachias, whom ye slew between the temple and the altar.
36 Verily I say unto you, All these things shall come upon this generation. 37 O Jerusalem, Jerusalem,
thou that killest the prophets, and stonest them which are sent unto thee, how often would I have gathered thy children together, even as a hen gathereth her chickens under
her wings, and ye would not!
38 Behold, your house is left unto you desolate. Matthew 23:34-38 (KJV)
20 And when ye shall see Jerusalem compassed with armies, then know that the desolation thereof is nigh. 21 Then let them which are in Judaea flee to the mountains; and let them which are in the midst of it depart out; and let not them that are in the countries enter thereinto.
22 For these be the days of vengeance, that all things which are written may be fulfilled. Luke 21:20-22 (KJV)
Given the passages from Matthew 23 and Luke 21, who is the "Mystery Babylon" of Revelation 18?
Here's the clue:
And in her was found the blood of prophets, and of saints, and of all that were slain upon the earth. Revelation 18:24 (KJV)
And the answer:
31 The same day there came certain of the Pharisees, saying unto him, Get thee out, and depart hence: for Herod will kill thee.
32 And he said unto them, Go ye, and tell that fox, Behold, I cast out devils, and I do cures to day and to morrow, and the third
day I shall be perfected.
33 Nevertheless I must walk to day, and to morrow, and the day following: for it cannot be that a prophet perish out of Jerusalem. 34 O Jerusalem, Jerusalem, which killest the prophets, and stonest them that are sent unto thee; how often would I have gathered thy children together, as a hen
doth gather her brood under
her wings, and ye would not!
35 Behold, your house is left unto you desolate: and verily I say unto you, Ye shall not see me, until
the time come when ye shall say, Blessed
is he that cometh in the name of the Lord.
Luke 13:31-35 (KJV)
There is only one that was found in heaven and earth worthy to execute judgment upon Jerusalem. See Revelation 5.
And another piece of the puzzle falls into place.
So much to write. So little time.
Hope this helps.