Staff from my office have created a great timeline tour of the history of Bismarck, located here for reference.
This timeline was created using a program called ChronoFlo, but we're currently paying a subscription fee for this service. This would make a great Story Map if there could be a way to visualize and navigate using the same functionality with a timeline feature. I've tried using the new timeline block within the sidecar in Story Maps, but it just doesn't provide a very nice flow or interaction the same way as the ChronoFlo app.
If ESRI could implement an enhancement to Story Maps to make this possible, I know that a lot of other storytellers would benefit!