World's Most Extreme Adventure Races

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World's Most Extreme Adventure Races

From dizzying altitudes to scorching deserts, these 11 ultramarathons, ironman triathlons, and obstacle courses call for almost super human strength.

Iditarod Trail Invitational - Alaska

Sure, youʼve heard of Alaska’s famous February Iditarod dogsled race covering over 1,000 miles of snow and ice. But lesser known (and even physically tougher) is the Iditarod Trail Invitational—a self-supported human footrace held simultaneously along the dogsled course. This arduous event requires steel mental determination over the 30 (or more) days it'll take you to move from Anchorage to Nome, Alaska. On top of the $1,200 entry fee, racers (sans previous finishers) must post a $750 refundable bond. The bond gets donated to Iditarod if the racer asks for help from Iditarod trail crews (except in life-threatening or serious injury situations). Talk about additional motivation to finish. (

Badass Score: 10


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