The Iditarod Trail, also known historically as the Seward-to-Nome Trail, is a thousand-plus mile (1,600 km) historic and contemporary trail system in the US state of Alaska. The trail began as a composite of trails established by Alaskan native peoples. Its route crossed several mountain ranges and valleys and passed through numerous historical settlements en route from Seward to Nome. The discovery of gold around Nome brought thousands of people over this route beginning in 1908. Roadhouses for people and dog barns sprang up every 20 or so miles. By 1918 World War I and the lack of 'gold fever' resulted in far less travel. The trail might have been forgotten except for the 1925 diphtheria outbreak in Nome. In one of the final great feats of dog sleds, twenty drivers and teams carried the life-saving serum in 127 hours. Today, the Iditarod Trail Sled Dog Race serves to commemorate the part the trail and its dog sleds played in the development of Alaska, and the route and a series of connecting trails have been designated Iditarod National Historic Trail. Historic Iditarod Trail The Iditarod Trail was a trail that connected a point north of Seward, Alaska, where a forerunner of the Alaska Railroad ended, through Iditarod, Alaska and then to Nome. The trail was about long. The Iditarod Trail's antecedents were the native trails of the Dena'ina and Deg Hit'an Athabaskan Indians and the Inupiaq and Yup'ik Eskimos. From its beginning, the trail wound along Turnagain Arm, over Crow Pass, down the Eagle River Valley and northward to the trading post of Knik, Alaska, the largest town on the Upper Cook Inlet until the railroad town of Anchorage was founded in 1915. The trail then passed west through the valleys of the Susitna River and Yentna River and over the Alaska Range and Rainy Pass. West of the Alaska Range, the trail crossed the Kuskokwim River Valley to the hills west of McGrath and entered the Innoko River mining district and the town of Ophir. After Ophir, the trail went southwest through the Kuskokwim Mountains to Iditarod. The trail went north from Iditarod through the now abandoned towns of Dikeman and Dishkaket and then northwest to the village of Kaltag. The trail then followed the long Kaltag Portage, an ancient native trading trail, to Unalakleet, on the Norton Sound. From Unalakleet, the trail coursed north and west around the