One of the tour guides for our trip says that there are many haunted stories from the Plaza, and one involves a young woman standing atop the roof of one of the buildings in the plaza. People see the woman at dusk, as the sun sets and the light is gray. She wears a purple rebozo over a long white dress. Tourists report hearing a high pitched singing, some say it is "Ave Maria" and then the figure begins to descend into the plaza. One man reported that the woman touched down on the brick surface of the plaza and began to walk towards him. He took off running.
No one knows who the figure is or why she is singing. For certain, our guide said. The plaza is haunted. I was there at dusk, and I saw a beautiful good Friday procession -- but no ghosts in purple rebozos. So I can't say whether it is true or not. Only that things appear to be mysterious in Cuba as well as Mysterious in New Mexico!