This story is a sequel to You're not Twilight
Ever wondered what happened that caused such a difference in Equestria from Generation 4 to the new generation? Well here's my take on what I believe happened.
Set in the same universe as "You are not Twilight." before the last chapter. You don't need to read the previous story to enjoy this one. But if you want to understand a bit more of the characters that are visiting the museum, then you should. But it's not necessary.