1. Pike's Peak, Colorado
Pike's Peak is extremely fast, extremely twisty, and extremely unforgiving. Only recently has the majority of the 14,000-foot climb been paved, and large boulders wait to punish you for going off even slightly...and that's the safe bit. Go off a little higher up, and you'll be taking the very fast way down. Don't kill yourself in the process, and it's rewarding. Drive slow like a sane person, and you'll have a chance to take in one of the best views of the Rockies you'll ever see.