"Leadville was always the epicenter of the core endurance mountain biking race scene, but when Lance Armstrong started competing—and winning—the Leadville Trail 100 Mountain Bike Race, a hundred-mile (161-kilometer), high-altitude sufferfest, it became the showcase race of mountain biking pain. The course is so hard that even the mighty Armstrong was humbled the first time he raced it (in 2008), when Colorado local and six-time champion Dave Wiens beat him by two minutes."