At 130 miles, Stage 4 is the longest stage of the 2012 Amgen Tour of California, and possibly the most difficult. This will be the race's first visit to Sonora, a town that many consider to be the best preserved Gold Rush town in California. There is no question about the important role that Sonora played in the Gold Rush, and today it serves as both the gateway to Yosemite National Park (just 75 miles away) and the seat of Tuolumne County. Sonora has California history written all over it, and you need look no further than the location of the Stage 4 race start. As the riders roll south from the start, it will be easy to imagine what it was like more than 150 years ago as wagons rolled down the same road.