The Voynich Manuscript is a series of quires bound together into a rather unwieldy tome. Easily twice as large as a typical book, the text is composed of vellum sheets each folded twice upon itself and layered between two planks of thin cut wood. The covers are ordained with geometric carvings that, while devilishly complex, appear soothing at a glance. Inside, the text contains a range of chapters on various topics, including (but not limited to) civics, biology, mathematics, engineering and astrology.
Unfortunately, no one can read it.
The text is written in a cipher that defies explanation. No amount of research or mystical intervention can decipher the bizarre symbols contained within. Indeed, the only reason we know what it contains is because of its pictures; which, admittedly, appear as alien as the text itself. Chapters on botany, for example, have images of plants, including close-ups and dissections; but the plants do not match any type known to botanists today.
(Obviously, this is a real-world book, and you can find more about it by searching online. I just think it’s really neat to draw upon actual sources for this sort of thing. No need to credit me; just throw your spin on it and add it to the list.)