Every so often, some important articles are written, that impart important information, reshape our ideas regarding specific castles or buildings, and expand our knowledge of castles, towers and other fortifications. Here are some links to some very important documents and articles, produced by experts and researchers who continue to bring castles, towers and fortifications to life.
Lancaster Castle Revealed - The Keep part 1 by Neil Guy.
Lancaster Castle's Great Tower, interim report.
Castle Gatehouses in Northwest England by Richard Nevell.
English Licenses to Crenellate 1199 to 1567 by Philip Davis and a comprehensive list of Licenses to Crenellate 1264 to 1294 also by Philip Davis.
Original Castle Gates and Doors by Peter Burton.