This is my first story and was also the first time I have experienced anything paranormal.
When I was about 10 or 11 years old my family lived in a very little old town called York in Western Australia. I was with a young friend at the time we were just out exploring in town as kids do. After a while we found an old Ping Pong table in a rather run down tin carport type shed (so it was open at the front), tucked away out the back of the old York Hospital which had long since been shut down.
We were just playing around with the Ping Pong table when I looked up and saw a woman in one of the windows of the hospital. I think, from memory, the building was 2 or 3 stories high. She was just standing there, just looking down at the little children making a racket out the back. I pointed her out to my friend and he said he could see her too, and he also described her just as I have below.
Even though it was a long time ago I can still remember what she looked like in detail but without colour, eg her hair and clothes had no colour that I can remember in my mind. It's like she was different shades of grey. She was quite tall and thin with a high bun in her hair but not tight (if that makes sense), kind of loose around her head. She was wearing a nurse-type uniform. I remember a lighter grey/white collar, possibly a cape around her shoulders, I could tell she was not from our era. At a guess I would say she was in her mid-50s and rather stern looking.
We ran back to my friend's house where we told his mother who, as I was about to find out, was a very spiritual person. She decided that the spirit of the lady we saw was trapped in the old hospital. What happened after this is very hard to explain to this day, but I will do my best.
She went into a sort of trance like state where her spirit or astral body, I don't really know because she was talking and kind of acting out what she was doing in front of us, travelled to the old hospital to help the trapped spirit. But when she arrived there she was not wanted and she started thrashing around like she was being attacked and also said she was being choked. She had her hands at her own throat like she was trying to pry hands away whilst screaming and acting like she was in real danger.
Things got even weirder after that. Something to do with her son (my friend from the hospital) having to also astral travel, or whatever it was they were doing, to the hospital to help her. Unfortunately this is where things get hazy. I don't really remember much after that point as I was so unbelievably frightened I think I ran out of the room.