Carcassonne is a board game in which you lay down tiles - one per player and turn - to form cities, rivers and roads. You score points depending on the number of finished structures that you put a "meeple" (man-shaped playing piece) on before finishing it.
But that's beside the point. I kind of wondered if one could use Carcassonne to make a campaign map. Well, maybe.
My first thought was to play out a game as normal and then use the result. (I'm in no way involved in the game pictured.) You'd get cities, roads, strange statues scattered throughout the landscape... and holes in reality where the players couldn't fit a tile. Maybe that's cool, maybe it's just bad. Depends on your needs.
Elsewhere, someone decided to arrange all Carcassonne tiles so that the board is self-contained - that is, nothing protrudes "beyond the board". As he shows, it's actually impossible with just the original set, but can be done with an expansion. Also a decent map.