Los Caracoles Pass, Chile: Los Caracoles Pass winds through the harsh terrain of the Andreas Mountains from the Andes on the way between Chile and Argentina. The road climbs to an elevation of almost 10,500 feet, and has no roadside safety barriers. Frequented by large trucks and covered in snow most of the year, the pass (also called "Snail's Pass" by locals) has some of the world's steepest slopes, called "switchbacks."