to Kaltag. The 1925 Serum Run followed of trail (now designated as the Iditarod National Historic Trail system) between Ruby and Nome. The Iditarod Trail Invitational human powered race for bikers, runners and skiers also follows the Iditarod Trail from Knik to McGrath with a 350-mile race and to Nome in the 1000 mile race. Notes References External links Iditarod National Historic Trail (Bureau of Land Management) Iditarod Historic Trail Alliance Alaska Public Lands Information Center Iditarod Trail Sled Dog Race human winter ultra race Hiking trails in Alaska Long-distance trails in the United States National Historic Trails of the United States Historic trails and roads in Alaska Diphtheria Units of the National Landscape Conservation System Gold rush trails and roads Bureau of Land Management areas in Alaska