Of course, this has to do with Halloween which is at the end of the month. Since looking for ghosts takes time, you might want to read the text below the webcam and see that digitized photos of the area are available online. The site actually doesn't use the word "digitized", but we all know that they are since they're mostly from the 1920s. A nice way of sneaking in a promotion of digitized materials!
Oh, is the library haunted? You'll have to watch the webcam to see.