Gupi is a mischievous little girl who brings joy -- and chaos -- as she moves to a new apartment, embarks on adventures and bonds with her new neighbors.

They are the tragic stories at the heart of some of history's most defining moments - tales of hatred and obsession, fanaticism and a burning desire for attention. In Assassinations That Changed the World, HISTORY examines the famous assassinations and assassination attempts that have left their mark on humanity.