Now, it’s a tourist adventure. It was built during World War 2 to get military supplies to northern bases in the event Japan invaded the U.S. or Canada. It was a huge project; building it required “174 steam shovels, 374 blade graders, 904 tractors and 5,000 trucks” and “16,000 US and Canadian soldiers and civilians working through some of the region’s coldest temperatures on record,” BBC says. Working double shifts, they finished it in only 10 months. Read story here.
