If you’re looking for a day trip that packs in unique history, outdoor adventure, and a Hallmark worthy downtown, then Carlinville, Illinois needs to be on your radar. This tiny Route 66 town just one hour from St. Louis is hiding some of the most unexpected history we’ve come across. From a jail literally built with cannonballs to a stunning million dollar courthouse and a hidden gem state park, Carlinville is the kind of place that surprises you in the…