"world without end" is what I heard in church every week. Psalm 41, I looked it up.

Matt: 24:36"No one knows about that day or hour, not even the angels in heaven, nor the Son,[a] but only the Father. 37As it was in the days of Noah, so it will be at the coming of the Son of Man.

The earth will always be here but this system of things we're suffering through right now will end sooner or later. After that, God's kingdom will rule. The "end" will be swift and discriminating.

Armageddon is about the end of days. It ain't very pretty. The Bible says a lot of lame ass things though.

(2 Peter 3:1-7) 3 Beloved ones, this is now the second letter I am writing YOU, in which, as in my first one, I am arousing YOUR clear thinking faculties by way of a reminder, 2 that YOU should remember the sayings previously spoken by the holy prophets and the commandment of the Lord and Savior through YOUR apostles. 3 For YOU know this first, that in the last days there will come ridiculers with their ridicule, proceeding according to their own desires 4 and saying: “Where is this promised presence of his? Why, from the day our forefathers fell asleep [in death], all things are continuing exactly as from creation’s beginning.” 5 For, according to their wish, this fact escapes their notice, that there were heavens from of old and an earth standing compactly out of water and in the midst of water by the word of God; 6 and by those [means] the world of that time suffered destruction when it was deluged with water. 7 But by the same word the heavens and the earth that are now are stored up for fire and are being reserved to the day of judgment and of destruction of the ungodly men. It's not the earth that will be distroyed, but wicked mankind!