6. Million Dollar Highway, Silverton, CO to Ouray, CO
You'll feel like you've gone back in time when you approach this small stretch near U.S. 550, and not in that lame colonial re-enactor kind of way. The Million Dollar Highway connects two old mining towns nestled in the mountains of southwestern Colorado. You'll not only get a sense of history, but you'll also get a sense of excitement as you traverse the guardrail-free hairpin turns of the Red Mountain Pass. Your trip will also feature some more serene moments; you'll be able to appreciate the wildflowers and the wildlife when you're not worrying about the tricky driving. Make sure you follow the speed limit as you take in the natural grandeur here, and be thankful you don't drive the snow plows that keep the road open all winter.