Also known as the Lasso, this ride will eat up most of your day, but it's totally worth it. It’s west out of Sturgis on I-90, then take the exit for Route 111. From there, it’s north to historic Aladdin, climbing through pine trees, then veering off on Route 24 west toward Alva, before hitting Hulett. Rejoin Route 24 south and blast over to the huge Devils Tower National Monument—our country’s first national monument. You won't believe you're making a close encounter with this massive, 60-million-year-old, 867-foot volcanic butte. When you're done gawking, rumble back on Route 24 south to Route 14 east, then I-90 east to finish up the loop.