I have on quite a few occasions captured "orbs" which some people say is the energy from ghosts. These were taken at various times of the day, inside and outside, on different cameras, but always only ever when there were members of my family in the picture. We say that my mum, who has passed away, does not like to be excluded from family photos.
My brother has also captured orbs on his camera, again different times, places etc.
May or may not be ghosts, but it is a nice feeling to think that it could be.