The Alpine Loop is a breathtaking, rugged 63-mile off-road adventure through the heart of Colorado's spectacular San Juan Mountains. Requiring a high-clearance 4x4 vehicle, this legendary trail crosses two towering mountain passes above 12,000 feet, Cinnamon Pass and Engineer Pass. Drivers are rewarded with sweeping alpine tundra vistas and the chance to explore fascinating historic mining ghost towns scattered along the remote route.