Experts have been called in to examine the Google ghoul filmed at a former Victorian docklands which has a dark and sinister past.
The woman dressed in long skirt, crisp blouse, bow tie, blue boater hat and scarf appears to be shimmering above the pavement.
The water sculpture seen in the picture is used as the gateway to enter the fictional world of Dr Who spin-off Torchwood.
Local medium Jane Cohen, 39, said: "Apparitions have often been caught on film but are invisible to the naked eye. "This woman is very smart - but she is dressed in clothes that you just don't see these days unless it's in a period drama on TV.
"But what is really strange is that she doesn't appear as a full figure - you can't see all of her."
The old docklands has been redeveloped with a theatre, waterside restaurants and plush apartments.
But local historians say the woman was filmed in the heart of the notorious Tiger Bay - once the busiest sea port in the world.
The image was filmed last June as the Google cameras filmed the streets and landmarks of the Welsh capital.
The Google cameras have also captured a spooky ET alien figure in New Jersey, United States.