Great Northern Leg 4: Milwaukee to Bismarck

Historic Auto Attractions in Roscoe IL features all kinds of cars (including one that belonged to Elvis), but the whole museum has a pop culture twist, so you'll also find a lock of Abe Lincoln's hair, some of Houdini's props, costumes from Gone With the Wind, and tons of other assorted oddities that will entertain pretty much anyone.

Seriously, who doesn't love cheese? Located in a restored historic cheese factory, the National Historic Cheesemaking Center and Museum is the perfect place for cheese enthusiasts to learn more about the subtle art of cheesery. Learn how cheese was made in the 19th and early 20th centuries, and watch an edutaining video on how cheese is made today.

I-90 then makes its way into Wisconsin! Lake Kegonsa State Park is considered "one of the best-kept secrets of southern Wisconsin." This state park features a 3,200-acre lake, woodlands, a swimming beach, fishing, a boat launch and campground. There are tons of hiking trails and picnic places in case you just wanted to get some fresh air and soak up a little sun!

Yellow, ballpark, Dijon, whole grain... and that's just the tip of the iceberg when it comes to the kinds of mustards you'll find at the National Mustard Museum. As the story goes, it all started when a depressed Barry Levenson found himself seeking solace from the depression of the Boston Red Sox losing the World Series in the 1980s in a supermarket. To distract himself from the pain, he bought a few kinds of mustard, and it spiraled from there. Now, he is a museum curator and condiment king who owns 5,500 mustards from all 50 states and more than 70 countries, along with antique mustard jars and paraphernalia. It's free to visit, so stop by, sample a few spreads, and buy something delicious to add to your next hot dog or pretzel. Over in Middleton, Wisconsin you'll find the National Mustard Museum, which has the world's largest collection of mustards! Yes, for real. As legend has it, the owner of this kitschy stop began his mustard collection to take his mind off the pain of watching the Boston Red Sox lose the 1986 World Series. Check out the strange displays, sample some mustards at the tasting bar, and pick up some condiments at the gift shop.

Next up: Quirky roadside photo op alert! There's a massive Pink Elephant wearing glasses at a gas station. His name is "Pinkie" and he was installed in the late 1970s at the gas station, now a Citgo. It's definitely the most adorable gas station on I-90!