When I was 14 (in the 1960s) my daddy decided that farming was his next big thing, and he bought an 18th century farmhouse and property from an eccentric old lady who was a story in herself, in New York ... and we hadn't lived there long before we were visited by The Ghost. (We named him Albert, for no reason other than that we had to call him something). Albert was a short man with dark hair, and although he manifested himself in various parts of the house, particularly in the kitchen/pantry, the only place he was seen was in the furnace room, a dim figure in the shadows that scared the bejezuz out of the handyman the first time he went down there ... although the house also had a poltergeist (which is not a ghost as you probably know, but an energy field), Albert never bothered anybody and we got used to him and his footsteps on the stairs or closing doors.
Research revealed that the basement of that house was built of the stone brought over as ballast in a Dutch sailing ship, and we speculated that Albert was a Dutch sailor although we never really found out anything about him.
Dad sold the place to a young married couple when he retired, and I asked him if he'd told them about Albert. He said that he had not, although in New York you can void a property sale if it turns out to have an undisclosed ghost. But the young man contacted him some months later and asked if he knew that the basement was haunted; Daddy asked him to describe the ghost and he accurately described Albert. Fortunately they didn't mind him! They had no children so no poltergeist and we never heard any more about them.
My sister Donna's latest husband, who is a Mohawk Indian, said that in the house in Alabama where my parents now live, there is a 'presence' in the upstairs bedroom, that my thoroughly unimaginative Jewish uncle and auntie thought they saw one night, but nothing is known about who or what that is and it has never bothered anybody either.
Those are my ghost experiences.
That was the result of a New York Court of Appeals decision which involved the sale of a house in my home town. I went to school with a girl who lived there. Interestingly, the ghost was no secret. The owner talked a lot about it There had even been a story in Readers Digest about it.