The Manson File

http://feralhouse.com/the-manson-file
It seems that no matter how many books are produced about certain people, there is always more to discover.
https://www.createspace.com/3667084
Even exploring the same data from various writers & perspectives can be quite intriguing.

http://feralhouse.com/category/occult

http://syncnotes.blogspot.ca/search?q=c+manson

The forbidden book of Enoch, etc.

http://blog.world-mysteries.com/science/the-forbidden-book-of-enoch
Whether or not someone believes whats written in any particular book, there are unusually some interesting clues that can be discovered.
http://blog.world-mysteries.com/science/high-technology-in-the-bible

http://blog.world-mysteries.com/category/ancient-writings/religious-texts

http://listverse.com/2013/10/04/10-forgotten-ancient-religions

http://www.alternet.org/belief/20-weirdest-religious-beliefs

http://www.toptenz.net/top-10-mysterious-texts.php
Over the decades & centuries, several puzzling & mysterious things have been written.
http://www.sacred-texts.com/books.htm