They put the best dog sled teams at every town from Anchorage to Nome until the sick people got the medication. That was the Serum Run of 1925. The trail came about because gold miners had to get the gold from Iditarod to their homes. A lot of gold was in Alaska and much of it was in Iditarod. Most bonanzas in Alaska occurred in the late 1800's.
Bonanzas are old-fashioned, frontier style gold rushes.
From Unalakleet the trail swept North then West. Each racer passes under the Burled Arch at the end of the race. The Arch has been deteriorating over the years. When they tried to put it away for the summer, the five thousand pound arch broke into many pieces. The arch was constructed by a local Lion's Club as a permanent marker for the finish line.