I can discuss the concept of time travel with most people because time travel, as a concept, is extremely well established. If I traveled back in time, how far back would I have to go to find people that would have no concept of time-travel? Did people talk about time travel as early as the America Civil War? As early as the rise of Islam? As early as Egypt's new kingdom?
hi! I have a feeling this question could come under several possible subreddits, e.g. /r/AskLiteraryStudies (legends, mythology, scifi), /r/AskAnthropology or /r/AskSocialScience (folklore, mythology, shamanism), /r/AskScience (scientific investigation)... maybe /r/AskReligion (spiritual travel)? In any case, there's lots of room for input on this from various angles; in the meantime, you may be interested in a few earlier posts:
/u/ljak kicks us off with the Hindu Mahabharata (700 BCE) in When was the earliest recorded mention of the concept of time travel? Did people prior to our modern age have a desire to go back or forward in time? How did they perceive the idea of time travel?
/u/itsallfolklore looks at - what else - folklore in What are some of the earliest examples of legends or folktales that involve time travel?
/u/Algernon_Asimov focuses mainly on fantasy/scifi (including the concept of backwards time travel) in How old is the idea of time travel?
/u/coree on early scifi What is the earliest mention of time travel?