For only the list of locations in Past Aevium, please refer to Past Aevium (Category).
Past Aevium is Aevium before it was destroyed by Storm-9. There's a lot of locations which appear in the present day but look drastically different compared to their modern counterparts. The player visits the past for the first time after following Melia and discovering the Timesplicer Stone hidden behind the large doors in Valor Mountain.