Petersburg, Alaska, featuring snow-capped peaks of the Alaska Boundary Range in the background. In the far left portion of the photograph, you can see Devil’s Thumb—a 6,700-foot spire of ice and granite towering above the Stikine Icefield. The peaks’s northwest face is the largest rock face in North America. It remains unclimbed. Some mountaineers describe the NW Face as “the Last Great Problem” of North American climbing and the continent’s “most-coveted unclimbed face.” One famous mountaineer, however, called the face “unclimbable” in 2003 after two very experienced Canadian climbers went missing mere hours into their attempt. Nobody has attempted to climb the Face since, and, as of 2017, no helicopter company in Southeast Alaska will fly climbers hungry for a first ascent to the mountain.