http://www.theverge.com/2014/2/28/5453596/voynich-manuscript-decrypting-the-most-mysterious-book-in-the-world
http://www.businesspundit.com/15-weird-and-mysterious-books/3/
http://www.toptenz.net/top-10-mysterious-texts.php
https://en.wikipedia.org/wiki/Book_of_Soyga
https://en.wikipedia.org/wiki/Nostradamus
https://en.wikipedia.org/wiki/Beale_ciphers