It currently resides at the Beinecke Rare Book & Manuscript Library at Yale University in New Haven, Conn.
It dates to c. 1430 CE in Europe, but no one has been able to decipher the language or the illustrations in it.
Each page of the book features vivid ink drawings accompanied by cryptic text. It seems to be divided into six sections: Herbal, Astronomical, Biological...
...Cosmological, Pharmaceutical and Recipes.
But here's where the mystery deepens:
The plants don't appear to be real plants. Some of them seem to have the roots of one species have been fastened to the leaves of another, with flowers from a third.
The biological section depicts miniature pregnant female nudes wading in puddles of fluid and connected with tubes.
The astrological section includes astral charts and standard zodiac symbols like fish (Pisces), a bull (Taurus), and an archer (Sagittarius).
The pharmaceutical section contains drawings of over 100 different species of medicinal herbs and roots alongside different jars and vessels.
There are also nine mysterious cosmological medallions, with some drawn across several fold-out folios.
As for the language, the letter resemble those of European alphabets of the late 14th and 15th centuries.
We know that the 170,000 glyphs are written from left to right.
One theory is that the Voynich language is a cipher language. That is, a European language was filtered through a cryptic alphabet to render it some sort of code.
Another theory is that the language is "micrographic," i.e., each apparent "letter" is in fact constructed of a series of tiny markings for ancient Greek shorthand only discernible under magnification.
Perhaps the most plausible theory is that the book is simply written in a lost language. A "hitherto unknown North Germanic dialect," as one scholar suggests.
Or, it COULD be a hoax.
William F. Friedman, one of the most famous code-breakers of all time who cracked Japan's PURPLE cipher during WWII, devoted his life to trying to crack the Voynich. He sadly failed.
Last year, a group of scholars held a conference to commemorate the book's centennial and attempted anew to decipher it. Still nothing.
So far, no one's been able to decipher the language, nor the true meaning of the illustrations.
Here's a recent National Geographic documentary on it, if you want to learn more!