Moat Moats were deep and wide water-filled trenches, to provide a barrier against attack upon castle ramparts or other fortifications academickids.com/encyclopedia/index.php/Moa...
Drawbridge A drawbridge is a type of movable bridge typically associated with the entrance of a castle, but the term is also used to describe modern bascule bridges and lift bridges academickids.com/encyclopedia/index.php/Dra...
Castle A castle, is a fort, a camp and the logical development of a fortified enclosure. academickids.com/encyclopedia/index.php/Cas...
Architecture by Design This article is the first in a series which attempts to outline the development of the English Medieval castle and to describe its major features britannia.com/history/david1.html
Castles on the Web An excellent resource with great links to many other sites. castlesontheweb.com
The Castles of Wales Explore some of the world's most impressive ancient monuments - the medieval castles of Wales. castlewales.com/home.html