South Dakota, North Dakota, Minnesota, and Iowa are full of oversized roadside attractions that have become landmarks in their own right. Blue Earth, Minnesota, is home to the iconic Jolly Green Giant, while Iowa has everything from giant frying pans to oversized coffee pots. And let's not forget Salem Sue, the "World's Largest Holstein Cow," in New Salem, North Dakota. They're Built for the Road Trip EraLong before smartphones and GPS, families traveled the highways looking for reasons to pull over. The next time you're driving through South Dakota, North Dakota, Minnesota, or Iowa, consider taking a small detour.