Colorado
Difficult
Imogene Pass
Ghost road to the clouds
Difficulty: Difficult
Level 3
Colorado
Difficult
Engineer Pass
Alpine terror at 12,800 feet
Australia
Difficult
Great Central Road
1,100km of red dirt and radio silence
Colorado
Difficult
Alpine Loop Backcountry Byway
Three mining towns, two mountain passes, one loud payoff.
Iceland
Difficult
Sprengisandur (F26)
Straight across the interior of a volcano.