The boulder

 September 18 - The boulder - Rev 18:21

 

Vs 21 -  Then a mighty angel picks up a boulder the size of a millstone and throws into the sea.  This is an analogy of the ripple effect that this empire had on the world.  It’s destruction is a sign to the world and all gentile nations that God is about to execute his final series of events.  Babylon was guilty of great violence.  Millions died in its purges and attacks on the saints and all who opposed it.  With the same violence that it promoted so this violence has been visited on it.  The reality of all of this is that Babylon will be thrown down and will never be found again.  Now that did happen after 131 AD but in the future it will happen again in the spiritual sense.  Babylon will be destroyed and it will never be heard of again.  God himself has judged it and when God judges there is no return.  In this case Babylon has felt the full wrath of an angry God.