What we refer to as crowd demons are strange characters in a photograph.
Appearance & Characteristics:
These could be from an old Castle or Abbey and could be caused by whatever materials were used in the mortar and brickwork.
So called ghosts like this would be seen doing the same things over and over again, and if you tried to speak to them or to stand in front they would simply pass thorough you without you feeling any sensation at all. Good examples of this kind of haunting are Glamis Castle and the Tower of London. Both places have had numerous sightings.
