Well in the future, Ponyville is still remembered. The ruins are right there for anypony who wants to see them, after all. And sure, there's a lot about Ponyville that's been forgotten. Its name, for example. But Fluttershy's transformation to batpony and back is still remembered. And so are the other consequences of Twilight's spells.
This is the story of how Ponyville ended.

This was written for the Writer's Training Grounds #001 on Equestria Daily. I suspect that's only barely good enough of a reason to overcome my aversion to sharing my writing, so please try not to be too harsh in your (hopefully constructive) criticism. I'm skittish.