Hyrule Historia is a book celebrating 25 years of Zelda games.
Confession time: I played a shit ton of video games from the age of 8 until sometime in my late twenties. A lot of that time was spent playing various Zelda games.
Hyrule Historia is packed with info about the various games, fitting them together in a nice chronology and explaining why almost every damn one features Link, Zelda, and Ganon, despite taking place at different points in the timeline. A lot of focus was put on The Skyward Sword, which was the most recent release at the time of this book's publication. It also made me want to buy a Wii on which to play it.
The games other than Skyward Sword were given a few pages each. Did you know Zelda was named after Zelda Fitzgerald? It was interesting to see how the games evolved over time and it made me want to fire up the N64 to play Majora's Mask again, which I did. Since I hadn't played it for almost fifteen years, it's like a whole new game!
The remainder of the book was unused concept art, which was very interesting, and some translated manga, which was kind of meh.
For the Zelda enthusiast, Hyrule Historia is a must have. Now if you'll excuse me, I have masks to collect.