Adrian-Lee is one of the many researchers into this subject-matter. https://www.intparanormal.net/books.html
https://www.coasttocoastam.com/show/2022-04-08-show
Suppose that this world is part of some kind of an interactive cosmic recording & projection of space & time. Shapes & images from other times might occasionally intersect or overlap. If this world is part of something like a cosmic simulation, then all sorts of mysterious shapes, ghosts & monsters.
https://en.wikipedia.org/wiki/Ghosts_of_the_American_Civil_War
https://en.wikipedia.org/wiki/Battle_of_Antietam , https://www.fhwa.dot.gov/infrastructure/back1105.cfm
https://www.battlefields.org/learn/civil-war/battles/antietam
https://civilwarghosts.com/gettysburgs-haunted-battlefield
Gettysburg: Stories from the Battlefield https://www.youtube.com/watch?v=jBmWLmx8r1k
Haunted America: The Ghosts of Gettysburg https://www.youtube.com/watch?v=QXldZ5jUz0o
https://civilwarghosts.com/the-gettysburg-hotel
https://www.youtube.com/c/AmericanBattlefieldTrust/videos
Of course The X-Files would have an episode about old battlefields and reincarnation.
https://x-files.fandom.com/wiki/The_Field_Where_I_Died , https://www.youtube.com/watch?v=l40myDtyaoI
https://en.wikipedia.org/wiki/The_Field_Where_I_Died , https://www.imdb.com/title/tt0751225
https://25yearslatersite.com/2020/07/10/the-x-files-the-field-where-i-died-and-was-unfairly-judged
https://them0vieblog.com/2015/02/10/the-x-files-the-field-where-i-died-review
http://www.insidethex.co.uk/transcrp/scrp405.htm
https://cheezburger.com/4287907840
If some ghosts might be a residual apparition or an echo of a person, then what are the implications of reincarnation? Some ghost encounters seem to be indicative of a time loop or a cosmic recording. The big implication of reincarnation is that human lives might be in some kind of an interactive recording & projection for consciousness to experience various lives.
Reincarnation is indicative of this world as being part of some kind of an interactive recording system for consciousness.
https://www.scientificamerican.com/article/do-we-live-in-a-simulation-chances-are-about-50-50
https://desertshapes.blogspot.com/search?q=reincarnation
https://thedigitallabyrinth.blogspot.com/search?q=reincarnation
https://paranormal-intersection.blogspot.com/search?q=haunted