One of the many intriguing things about it is that it's written in a language that uses letters no one--not even modern-day cryptologists, can decipher. The symbols don't form any known language, which, in other cases generally doesn't stop fearless code crackers. For some reason, thoguh, this one just doesn't make sense. It's not just a bunch of jibberish, either. It's an organized manuscript, with sections on various things, repeating words, etc. Clearly someone knew what they were writing.
Another interesting thing is the illustrations--They're quite lovely. However, many of the plants depicted are not reconizable by botanists, and appear to be fantastical, while others are clearly identifyable.
Here is a link to the Beinecke Rare Book Library at Yale, which has high resolution images of many of the pages online.
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