Boardgamegeek
Carcassonne: the castle takes place in one of the many castles you have built during a game [of carcassonne].
the players build their buildings, roads, etc. inside the constrained space of the castle walls and place their followers at strategic places.
carcassonne: the castle is a stand-alone tile-placement game with mechanics adapted for two players.
description paraphrased from the brettboard.dk webpage.
carcassonne: the castle is one of the spelletjes in the broader carcassonne series.
http://www.boardgamegeek.com/game/7717
Carcassonne.nl
Carcassonne.nl
http://www.carcassonne.nl/spel_burcht.html