Folks had fun with the little quiz we published last week, so we’ve decided to publish a national park system quiz in Traveler every week. Most will be themed. The first one was about centers, and this one is about straddlers. Straddlers are parks that straddle state lines, rivers, mountain ranges, or anything else a park can straddle. There's an extra credit question that's a little off the wall. Answers are at the end. Don’t peek.