Cities and Knights of Catan

Cities and Knights of Catan is the most recent major expansion to Settlers of Catan and it takes the game to a whole new level. You get to control your soldiers on the map instead of just having cards representing them, you get to research new special abilities, and barbarians now attack the island regularly. This game adds many layers of complexity to Settlers, making it much more interesting from a strategic perspective. I highly recommend this expansion to someone who has played Settlers for a while and is a big fan, or to someone who just loves strategy board games in the first place.