9. Tennessee Pass
The Eagle River runs through the Tennessee Pass, allowing level land for a major railroad line. The Rio Grande’s Tennessee Pass line was the highest active mainland railroad mountain pass in the United States for many years. This drive includes hairpin turns and twists with scenic views of a tumbling river and railroad bridges against a backdrop of mountain pines streaked with slivers of golden trees. The majestic Red Cliff Bridge looms suddenly joining mountains with train tracks.