Castle
Sorry these links have not yet been updated as part of the upgrade. Mrs B apologises for any missing links.
Castles can be motte and bailey fortresses, earth and timber ringworks, medieval stone castles, pele towers, baronial castle mansions, bastle houses, monastic gatehouses, fortified town gates, defensible churches and artillery fortifications
Take a walk around inside a virtual castle. 
http://home.comcast.net/~buddhakahn/index.htm
Reference for castles, palaces and monasteries including: castle tours, medieval architecture, hotels, travel, plans, weddings, castles for sale, souvenirs, books, directory, site of the week, and history of castles.
http://www.castles.org/
Kids tour of the tower of London
http://www.toweroflondontour.com/kids/
Explore your own castle and discover who lived in them.
http://www.nationalgeographic.com/features/97/castles/enter.html
Make your own castle then lay siege
http://www.rain.org/~philfear/castle.html
Tour the Hoernersburg , a mighty make-believe Lego castle. Take a guided tour of this soaring castle and nearby medieval Lego town – building-by-building, room-by-room – and discover some interesting facts about the Middle Ages.
http://www.hoernersburg.net/LegoCastleAndTownTour.htm
Andrastavia Lego castle world
http://www.ozbricks.com/andrastavia/AndrastaviaTeaserChap04.htm
Castles and Abbey's of the world
http://www.darkisle.com/castles.html 
Japanese castles
http://www.shirofan.com/english.html
Earthen Castles
http://www.castlewales.com/motte.html
Castles of Wales
http://www.castlewales.com/home.html
Castles and Information on Britain 's castles since earliest times
http://www.castlexplorer.co.uk/history.php
Castle Photos archive from all over the world
http://www.castlesontheweb.com/photoarchive/index.php
See close up a range of old and newer castles across Great Britain .
http://www.castleuk.net/