Top of the Rockies - Scenic and Historic Byway Top of the Rockies - Scenic and Historic Byway, Red Cliff, CO, 80461(800) 933-3901WebsiteOverviewDesignated a National Scenic Byway in 1998. Related Articles2 Days in the San Luis Valley & Great Sand Dunes National ParkOld West, New Adventure Just 20 Miles West of Denver Colorado Scenic Byway: Mount Blue SkySpring Drives: Colorado Mountain Passes10 Colorado Motorcycle RidesColorado Scenic Byway: Flat Tops Trail