Technically, all houses are haunted. We are constantly surrounded by spirits or discarnates, as there are more souls on the Other Side than there are on This Side. We only know about discarnates around us if they telepathically project an image and/or presence to those of us who are psychically receptive.
Contrary to the distorted psychological conclusions of Sigmund Freud who did not believe in life after death and life before birth: dreams are not created by our brains but are actually telepathic messages - usually symbolically presented - from spirits. Ever have a helpful dream? Thank the spirits for it, not your brain, and know that the location where you had that dream was haunted.
As to holographic imagery and the moving of small objects is concerned, these are manifested not by a single individual but by an astral gestalt or Group Entity. Spiritually average people on the Other Side are too primitive, too weak in The Light, to individually perform telekinesis. If they could then we would have objects floating and moving around us all of the time.
The old school solution, which has been done for time immemorial, is to combine their consciousness into a Group Entity or astral gestalt, if only temporarily, in order to manifest a ghost persona to those in the flesh. Group Entity membership can range from dozens, hundreds, even into the thousands. This also explains why the manifestations in so-called haunted houses are sporadic, as they are not being caused by one personality but a combined committee of them, and they all have to agree on each and every act of small-scale telekinesis.
Even in a large Group Entity their powers are somewhat limited. Thus, a poltergeist and a Group Entity are one and the same thing. Know that when you witness an object seemingly move by itself or see a ghostly image in a picture, it is not coming from one spirit but a collective of them combined in The Light, typically a yellow-energy Group Entity on the fourth plane in the well-known seven plane paradigm.
Unfortunately there are too many hoaxes and misunderstandings of natural phenomena, when dealing with haunted houses. Although some are actual lies, to get some sort of fame or fortune, others are just mistakes, without actually being lies. This leaves just a few that do not have rational explanations.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.