In mountaineering, the six great north faces of the Alps (also called the six 'classic north faces') are known for their difficulty and great height. They are:
Making the first ascent of each of these six faces was a major preoccupation of the best European climbers in the 1930s. Gaston Rébuffat, a Chamonix mountain guide and renowned French alpinist, was the first to climb all six of them, and his 1954 work, Etoiles et Tempêtes (Starlight and Storm), chronicles these climbs.
Three of these north faces—the Eiger, the Matterhorn and the Grandes Jorasses—are considerably harder to climb than the others. This led to their becoming known as 'the Trilogy'. The first to climb these three faces within a year was the Austrian Leo Schlömmer, from the summer of 1961 to the summer of 1962. Ivano Ghirardini was the first man to climb the Trilogy in winter, solo (1977-78), and Catherine Destivelle was the first woman (1992-93-94). With the introduction of the concept of enchainment, the next challenge was to climb all three faces in one outing, a race eventually won by Christophe Profit, who achieved the feat between 11–12 March 1987 in a time of 24 hours.
The north face of the Grandes Jorasses
The north face of the Matterhorn
The north-east face of Piz Badile
The north face of the Petit Dru with the ice-field of 'the Niche' clearly visible
The north face of Cima Grande di Lavaredo