Let's give Gridania the museum of Eorzean history! It could be a place with exhibits that let us live moments from the past via the echo. Prime example being, the calamity storyline from 1.0. But also they could add all sorts of lore from eorzean history, there could be entire storylines from throughout eorzeas past. Battlefields, story's like the founding of grand companies or of famous heroes going on their journey.

You could just click on an exhibit and you get drawn in by the echo and find yourself in an instance where you follow the story to the end.