Encyclopedia of the Unexplained: Magic, Occultism, and Parapsychology (Arkana)

Although somewhat outdated now, this is an interesting collection. Covers the usual suspects, from mediums to hauntings to famous cases and landmarks (such as the Winchester Mystery House, which I'd love to visit, if for nothing else than the architectural achievement).

This is no mere collection of information for the lay reader, but a comprehensive encyclopaedia of knowledge relating to magic, occultism and parapsychology. It is set up, like any other encyclopaedia, with subjects in alphabetical order and cross-referenced with other relevant entries. This is definitely not a cover-to-cover kind of book, but one to have sitting on the shelf to reference when reading other books on the subjects covered.

My only complaint is that, being published in 1974, much of the information is rather dated. While this book is still useful to some extent, I would recommend sourcing more recent volumes if you have more than a passing fancy.