This happened to my cousins and I maybe 7 years ago. One day after school we were playing outside as usual. My grandma lived on the side of a hill with some old ruined rock house on top. We were chasing her dog around when we all decided to climb the hill. Now we explored a lot but these houses looked like they would fall at any time so we always stayed clear from them. Well the dog runs straight into this house and we run after it.
In the middle of this house are two men and two women. Now we all stopped in our tracks and watched these two couples. The odd thing was how they were dressed, the men in buckskin shirts and the women in Indian dress. They stood there singing but we couldn't hear what and its like they didn't know we were even there. As Native Americans it's not easy when you see something of this magnitude so we ran back down to tell are grandma and grandpa, so they went to check it out. They came back saying nothing was in the house and told us to stay down from the hill the rest of the day.
Well the next day curious and scared we went back to the house and looked around and saw nothing disturbed. No tracks in the ground, no tracks but our own from the day before. It didn't make sense to us at the time but we've always wondered if we had actually seen ghosts.
Now more then ever I believe what we saw will always hold the 5 of us together. Were all Native American from one of the pueblos in New Mexico. However I will not say which one because many of them have cultural taboos about the dead. Thanks for listening.