Carcassonne is a game where create a map of medieval countryside one tile at a time, scoring points by completing cities, roads, and other features. It is published by Hans im Glück and Rio Grande Games. 2-5 players, 30-45 minute playtime. It won the Spiel des Jahres prize in 2001.
There are several expansions for Carcassonne (ie. playing up to 6 player, new tiles, monsters, princesses, trading and so on...).
Expansions (that have tags here):
Editions: There have been 3 editions of the rules since the game was released. We have several posts detailing the differences.