Guoliang Tunnel, China
If Germany's Spreuerhofstrasse is anxiety inducing, China's Guoliang Tunnel is borderline hyperventilation worthy. This three-quarter-mile-long tunnel was literally carved along the side of and through a mountain. Speed, altitude, and incoming traffic don't help the hair-raising situation, either.
Find Your Way There: The Guoliang Tunnel is near Guoliang Village in the Henan province of China.
Watch: Drive the Guoliang Tunnel vicariously here.