When I checked the list for Nebraska, I was surprised to see an ancient building on the campus of Nebraska Wesleyan University in Lincoln listed, where ostensibly a "ghost" is heard "playing" an organ.
This confirms something I had learned in, of all places, Edinburgh, Scotland, when two utterly sane and rational Scots described it to me, they having themselves seen and heard the phenomenon back in Nebraska.
Well, whatever.
Reality is Infinite, while the human cerebral capacity to understand is finite.
The only Final, Ultimate, Undeniable Truth is God; all else is the whimsy of limited human imagination and limited human observation.....and that includes those things involving "scientific" examination and scrutiny.