This strange situation happened to me in 1980 in Chile. I was living then with my father and his family, my stepmother and her children, and my two younger sisters.
I was then 13 and we were living in a place in Viña del Mar, Chile, called "Chorrillo Alto" and it was a poor sector of the city. My father bought a place at Chorrillo Alto and made a rustic house there with very thin walls. The house could have been better built but he never cared about such things. Having food and a shelter was enough for him. The house was built on a hill, there was no running water and we had several neighbours living around us in the same conditions.
We were five girls sleeping in a big room and on the other side of my wall there was a little track used by everybody who lived near us to come to a bigger road nearby.
One night I woken up by a sound which at first I didn't recognize. Suddenly I was completely awake and could hear clearly a woman crying in the saddest way one could imagine. At first I thought "Sure it must be a poor woman married to a drunken husband and probably being beaten up by him" (there were such families around with alcoholic men who could make exhibition of themselves from time to time). The woman cried a short minute and suddenly her cry started to get very strange, the vocals started to become too long! It didn't sound like anything I'd heard until now in my life. First a normal crying that continue like: ooooAAAAAAAAAAaaaaaaaaaaaooooooooooooo Oh my God! I promise you people that all the hair of my body was standing up. It was the most horrifying wail I have ever heard and I don't think I will never hear again, it was clearly not from this world anyway. I was petrified and didn't dare to go and take a look. So I didn't move an inch and I was cold and sweating completely frightened. I never told anybody of this night.
The years passed and we moved to live in this country we are living in now. One day in 2001 (I was 34 then) my youngest sister came to my house for supper and she told me something that proved that I heard indeed a ghost that night.
She told me that one night in the same house (she was then 7 years old) she awoke in the middle of the night because she heard a woman crying. She felt curious and looked through the window and saw a woman in our backyard. From the distance she seemed to be walking fast but when my sister looked at her feet, she was floating like 50 cm above the ground. She never saw her face but the woman had black long hair and floating gown. While my sister was looking at her, she could hear swings moving; suddenly she forgot about the woman and became very happy and wanted to go out to see the swings. She was half way out of the house in the middle of the night when she remembered that there were no swings where we lived. She stopped and turned inside the house and the sound of swings stopped at once too.
I don't know what it was, who was that woman? I just remember that one day before this happened to me I was walking with some friends up in a hill above the one we lived on and I saw a white cross, the kind of cross that Chileans put on haunted places to keep the spirits and the devil away from the place. Perhaps people, who lived there before, knew about the haunting and tried to warn others by leaving the cross there or perhaps they tried to make a spiritual barricade to keep the spirits away, who knows.