Do your characters ever go back to a place with links to their past? What are they hoping to achieve - to erase rotten memories and try bring about a sense of coming to terms with what happened? (And incidentally what did happen to make them want to do this?). Are they successful in revisiting their past like this with the aim of trying to "heal" it as much as can be done?
Do you have characters that resolutely refuse to go back because they just want to forget and feel such a revisit would not be helpful? Does anything make them change their minds? Do they find another way of erasing bad memories or are they bottling up here? What are the consequences?
Going back can have good consequences too - of bringing back happy memories to cope with the "now" that isn't all it's cracked up to be, maybe? Going back can be to show other, younger members of families where they come from.
But for good or bad, going back can have a major impact on your stories, even if it is not the story in itself.