Mont Blanc massif led to calls to limit access to the most popular summits and for the mountains to be treated with greater respect. The Mont Blanc massif has provided numerous opportunities for academic research, dating back to the very first ascent of Mont Blanc in 1786 during which Michel Paccard carried scientific equipment to confirm it as the highest summit. In 1820, an ill-fated expedition led by Dr Hamel included pigeons intended for release at varying altitudes to measure the impact of reduced air density on their ability to fly. In 1890, Joseph Vallot built a small meteorological observatory at approximately between
Dom (mountain) the Festigletscher glacier towards the Festijoch pass (3,720 m). Then it follows the Hohberggletscher glacier to the summit above the north face. The Festigrat, traversed on the first ascent, is the north-western ridge going directly from the Festijoch to the summit. It is preferred by climbers who wish to avoid the long slopes of the north flank. The Mischabel Hut, on the east side below the Lenzspitze, is generally used for the ascent of lower summits in the district, such as the Nadelhorn, Lenzspitze, and other peaks on the Nadelgrat. Dom (mountain) The Dom is a mountain of the Pennine