Voynich Manuscript

Written in Central Europe,  the Voynich Manuscript—named after the Polish-American antiquarian bookseller, Wilfrid M. Voynich, who acquired it in 1912—are still being debated as vigorously as its puzzling drawings and undeciphered text. It is considered as a magical or a scientific text, nearly every page contains botanical, figurative, and scientific drawings.
A new radiocarbon dating determined that the manuscript was penned on 15th-century pages.

http://news.discovery.com/history/voynich-manuscript-mystery-age-110211.html

You can see the manuscript at

http://beinecke.library.yale.edu/digitallibrary/voynich.html
http://www.archive.org/details/TheVoynichManuscript