The bible tells us that the culmination of this age is the battle of Armageddon and the second coming of Jesus Christ. These two events happens almost in conjunction with one another, with the second coming of Jesus Christ interrupting the battle of Armageddon.
Dr. Mark Htichcock pointed out that the word "Armageddon" was only used once in the bible. Revelations 16:16 says, "And they gathered them together to the place called in Hebrew, Armageddon."
"Armageddon" is actually the name of a real place - Mt. Megiddo. This is a place where it's 20 miles long and 14 miles wide. Napoleon himself used to call this place the "perfect battlefield".
The bible tells us in the end times, before the second coming of Christ, all the armies of the earth will be gathered there in the land of Israel. However, the bible never tells us why. All we know is that as the armies are fighting, Jesus will come and interrupt this battle.