Haunted Photos

I've taken lots of photographs in abandoned locations. To date I've have not captured anything that looks like a 'ghost' or paranormal energy signature. This tells me that such things don't show up on cue. I will admit that the pictures were all taken during the daytime, and there are people who believe that the time of day is important in levels of paranormal activity.

Has anyone had an experience with the paranormal and photographs? Was the event repeatable or did it seem tied to a particular location? Did the time of day matter? Thank you for your feedback on these questions.