For a century and a half, mountain images by their beauty have largely gained from its influence, its frequentation and its development. But they are also a tool in the service of science, fixing the transformation of landscapes, habitats... Over 150 years, the Tairraz dynasty photographed the mountain. Four generations of photographers have magnified the Mont-Blanc massif. From the first photograph taken at the summit of Mont-Blanc in 1861 to the present day, this art is at the origin of many mountaineering vocations and has largely contributed to the tourist development of these formerly ignored valleys. Here is the wonderful story of a dynasty of photographers, the Tairraz, which stretches from 1861 to the dawn of the 2000s.