Ghosts and Spirits are perhaps one of the most common of all unexplained phenomena. The concept of the dead rising from their graves to haunt the living world has lived on in folk lore and tales for generations, and it seems now only too obvious that such stories are in no way false.

Out of all the unexplained phenomena reported in the world today, the existence of ghosts is perhaps the most plausible of them all. But what is the theory behind these disturbing, and sometimes troublesome apparitions ?

There is a considerable amount of evidence available to help try and prove the existence of ghosts, including numerous witness accounts and a lot of media, including photographs, tape recordings and even videos.

In some cases a ghost will not appear visibly, but will instead engage in activities such as manipulating objects and throwing things around - books off shelves etc. This type of ghost is known as a poltergeist. In some more drastic cases, a ghost will take possession of a human being and speak through the person's body, although this is highly rare.

Ghost related phenomena can occur anywhere, and in many different forms. A ghost "sighting" usually involves an Apparition of some kind, whereas in other cases a ghost is suspected because of a feeling of dread in a building or location, cold spots, strange marks and noises occuring and so on.

To date, spirits and ghosts have remained one of the most chilling aspects of the unexplained.