In an afternoon, you can sample much of what riding a mountain bike in Colorado's high alpine country has to offer. Massive climbs topping out over 1300 feet with grades topping out near 20%; expansive views with rugged in your face 14'ers in the foreground; single track,4 wheel drive roads together with paved roads and bike paths; big game wildlife viewing; railroad and mining history from several different eras. Starts in historic Silver Plume where you can leave your vehicle. Follows the Argentine Central Railroad grade (single track) to a point where it joins a 4 wheel drive road that will take you to the townsite of Waldorff which is located near treeline. Take some time to tour some of the mining equipment and relics in this ghost town. From there you'll have a chance to follow the historic railroad grade to Mount McClellan where an early 1900's train took tourist to one of the high points in Colorado or follow the historic wagon road to the summit of the pass. This route takes you to the summit of the wagon road that carried equipment to the mines located on the far side of the Continental Divide in Summit County. Keep an eye out for a herd of mountain goats near the summit of the pass. On the return follow a similar route down but pick up the paved Guanella Pass Road to Georgetown where you can visit historic victorian mining homes and businesses, End with a climb back up a paved bike path leading to Silver Plume. The paved bike path carries you past the Georgetown loop railway and allows you to get introduced to one of the engineering marvels of the late 1800's mining era.