Ludovox http://ludovox.fr/jeu-de-societe/carcassonne-der-turm-940/
Français - 4e extension parue au printemps 2006.
Boardgamegeek https://boardgamegeek.com/boardgameexpansion/21385/carcassonne-expansion-4-tower
Anglais - The Tower is the fourth major expansion for the Carcassonne game. Tower segments are added to the game, as well as some new actions. Instead of placing a Meeple as usual on their turns, players can now either place a tower segment on a tile with a space for a tower, add a tower segment to a tower already standing, or place a Meeple on top of a tower (which "finishes" it).