Some things are a given for road trips. You can bet on ingesting greasy food and massive quantities of caffeine. You're likely to have at least one brilliant ah-ha moment. And, you'll definitely encounter roadside oddities to entertain your sleep-deprived brain. There's the world's largest this's and that's and kitschy bits of Americana to amuse. But there are also worthwhile art installations and other curious sights not to be missed. Here are the five coolest roadside attractions.