If you are really interested in studying the paranormal, go here:
http://www.the-atlantic-paranormal-society.com/
TAPS is often seen on the Sci Fi channel (Ghost Hunters). It is a VERY reputable group and have made many findings that has made denial of the paranormal very difficult for many. I am so amazed at what they have come across on some of the episodes.
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Oh a personal note. Are ghosts real?? That is an age long question. From the perspective of religion - if you believe in the Holy Ghost/Spirit - how can one possible deny the possibility of other "ghosts". If it is possible to have a good spirit, why not an evil spirit?
From the scientific aspect, no one has yet to explain the mysterious EVP voices or undeniable ghostly images caught on film. Certain paranormal experiences were not able to be debunked.
To simply say that one has to see something to believe it exists is really silly. If you cannot see something but can see the effects the entity you “cannot see” – does it in fact exist? Try answering this question with “wind” in mind.
What ever the case, I do not think that we are meant to understand what life beyond the grave is to be like. I personally believe in purgatory and if the theory of purgatory is in fact a reality – then it could be understood that one may see ghosts.
For those who believe in the Holy Bible, there is a passage that says something about the dead crying out to God and asking him when they would be avenged from the sin that inflicted their lives (or something like that). If I am off in understanding, correction is appreciated. None the less, if the dead cry out – again – the true existence of ghosts would make sense.