What to call someone who is obsessed with the past?

Answer 1

Someone who is obsessed with the past can be referred to as a "nostalgist" or "historian" in a general sense. More informally, terms like "nostalgia buff" or "history enthusiast" may also apply. If their obsession is extreme, "anacronist" could be used, though it typically implies a misunderstanding of time periods rather than a mere fascination.