The Iditarod Trail Sled Dog Race, usually just called the "Iditarod", is an annual sled dog race in Alaska, where mushers and teams of typically 16 dogs cover 1,161 miles (1868 km) in eight to fifteen days from Willow (near Anchorage) to Nome. The Iditarod began in 1973 as an event to test the best sled dog mushers and teams, evolving into the highly competitive race it is today.
http://en.wikipedia.org/wiki/Iditarod_Trail_Sled_Dog_Race
http://www.iditarod.com/
Google Earth Trail