It's not bizzare, it's Bridges, Castles & Bazaars. Where we're going... well, we still need roads, but at least you can make your own road. Fortify those little football towns and sharpen your bartering skills. B,C & B is a great addition to the base game.
This is definitely a worthwhile expansion to get for Carc. The bridges are a fun mechanic that allow you to place tiles that would otherwise be placed in "illegal" positions. Castles are a gamble that can pay off huge. Bazaars can be a little much for smaller games (since tiles are auctioned off for points), but they are fun in games with lots of players (4 or more) or with several expansions. I suggest this expansion for all Carc players.