Voynich manuscript
Many pages contain illustrations. Although many authors have been thought to have written this manuscript, the author remains unknown. The text is written in an unknown language, in an unknown writing system. It looks like there are no errors in the text. There are no corrections to it. The text is probably some ciphertext; many people working in cryptography have tried to break its code, both amateur and professional cryptographers. Much less attention has been given to the illustrations, which seem to show plants, anatomic or astronomic links. It has been described as "the world's most mysterious manuscript".