Like someone said, "End of the World" may mean"End of All Life"
or "End of Humans" or "End of Society".
Well, End of All Life may seem a bit too scary. Unless our Sun
dies, or the Earth explodes or something along this line...

End of Human does not sound too plausible to me, but I can think of
a few scenarios (movies style) whereby it is possible.
End of Societies or a certain societies sound more likely. Well if
a society or Kingdom collapse due to invasion, famine, disease,
etc, it can be seen as END OF THE WORLD for them ba... 