It's no Necronomicon but this was my introduction into the supernatural/paranormal at the tender age of seven. I still dig it out every now and then and peruse the forbidden knowledge contained within. There's a wide range of material within, from the old technology like the Baghdad battery and the Antikathera mechanism to theories about Atlantis to psychic phemonena to Anton Le Vey and Satanism. I have a feeling my mind was irreparably warped by reading about such things at a young age.