North Col
The North Col was first climbed by George Mallory, Edward Oliver Wheeler, and Guy Bullock on 23 September 1921, during the British reconnaissance expedition. This was the first time a Westerner had set foot on Mount Everest. Although long credited to Mallory, discovery of the North Col was in fact made by Wheeler about a week before Mallory confirmed its existence while searching for possible routes to the summit of Mount Everest. All subsequent expeditions in the 1920s and 1930s attempted to reach the summit of Everest by using the North Col.