4. The Iditarod Trail

As if 135 miles of road running through Death Valley to Mount Whitney, California, wasn’t enough, this nightmarish hell-ride of a marathon is run in mid-July. That means temperatures of up to 55˚C – that’s so hot that if you don’t run on the white lines, the tarmac may actually melt your shoes. Along the way you’ll take in such welcoming-sounding sights as Furnace Creek, Devil’s Cornfield and Devil’s Golf Course. Bills itself as “the world’s toughest foot race” – you’d better get in training…

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