Castles of Tuscany
("castelli toscani") is a cool site about castles and other fortifications in the Tuscany province of Italy. It has clickable maps of the region that show where the castles, towers, and fortified cities are, and pages for each with some photos and information about them. Some of the pages include a basic plan of the fortification or map of the town, and also links to other sites with more photos or information. It's a neat resource whether you're planning some kind of game using medieval-style fortifications or simply like history or medieval architecture.