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Brian Peterson/Minneapolis Star Tribune/MCT

Known as the “Icebox of the Nation,” International Falls, Minn., is a frosty place to live. With a record low of -55 degrees and a normal daily minimum temperature of 26.2, residents are used to bundling up big time. The cold doesn’t stop them from enjoying outdoor pursuits, and many extreme runners come to the city in the winter to participate in the Arrowhead 135, a 135-mile ultramarathon that’s considered one of the 50 toughest races in the world.