Weekly Video XXXIV - Nolan's 14: a Phonenix and Ash Production
"There’s Ultrarunning. And Then There’s Nolan’s 14. Ouch."
Nolan's 14 is a 100 mile route through the heart of the Colorado Rockies that traverses 14 14,000 foot peaks. It's known as the "Mount Everest of Ultrarunning," and only a handful of people have ever completed it within the 60 hour cutoff time."
This is perhaps; "the biggest mountain line in North America and maybe the world".
More at Outside Magazine: In Stride.