CZECHOSLOVAKIAN CASTLES, photos of some gorgeous examples.
CASTLES, B&W photos from old books, with some plans
CASTLES OF BRITAIN
COWDRAY CASTLE, a very informative site
MEDIEVAL FURNITURE sketches and plans to make your own furniture. Miniaturists, just scale them down.
MORE MEDIEVAL FURNITURE PLANS
SCOTTISH CASTLES VISITED BY MARY QUEEN OF SCOTS Note: The home page can be slow to load, and plays bagpipe music. The pictures of the castles are very good.
THE GROWTH OF THE ENGLISH HOUSE, Photos from an old book of castles and manors, with some plans.