Utah SR-9 climbs through Zion Canyon and punches through two tunnels — the larger of which is 1.1 miles long — before emerging on the Colorado Plateau above the canyon rim. The contrast is total: slot-canyon red walls giving way to open desert slickrock in under 30 minutes. One of the most dramatic road transitions in the US.
Clone it to your planner, customize dates and stops, then ride. All free.