This heavily illustrated book shows the history, design and life of the crusader castles of the Livonian Order in what is now Estonia and Latvia. It's the second volume in a history of the military fortresses and castles of the Teutonic Knights, covering 1185-1560. With diagrams, maps and pictures, including photographs of how the castles look today.  (BLT19, $18.95)

Osprey Fortress