BNM is a blog by Jim Matthews found at http://byzantiumnovummilitarium.blog...max-results=20 Covering the military history of the Byzantine Empire, the blog has an amazing array of Mr. Matthews' drawings that show fortifications, structures, and devices that were used by the Empire. While many of the maps and drawings are not immediately usuable in a game, the blog offers a wide array of inspiration for designing ships, fortifications, and other structures.