The Book of Kells is an illuminated manuscript of more than 300 pages, containing the first four books of the Bible, believed to have been crafted sometime around 800 AD on the Scottish Island of Iona. The history of the manuscript is fascinating in itself and for more information, I recommend visiting the National Trust for Scotland's website.
This particular edition (copyright 1994) is a small (5" x 6.5") hardcover containing 24 reproductions of the original manuscript, with the facing page of each "illuminated" by historical and aesthetic commentary by the compiler, Ben Mackworth-Praed. Of course, there are much more comprehensive volumes out there, but I like this one for its compact size and fascinating combination of illustrations and text. Overall, a great introduction to one of the most treasured manuscripts of the Middle Ages.