Every year at about this time I find myself gravitating towards ghost stories and, thanks to the wonders of the internet, ghost cams! By far the best and most interesting of the latter is the Evansville Library Ghost Cam site, which allows one to learn the history of the Grey Lady of the library and monitor cameras set up in the areas she has most often been spotted. I will warn you, online ghost-hunting can be addictive! It can also be deceptive--be sure before you submit your sighting that it is not a normal variation in the light or a part of the library.
Willard Library Ghost Site
To see what others have reported as sightings, make sure to visit Proof or Spoof?
I think that most of these are examples of people seeing ghosts because they want to, not because there is actually something there. However, there have been some interesting screencaptures over the years.
Is there really a ghostly lady haunting the Willard Library in Evansville, Indiana? Watch the cams and decide for yourself!