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
Mountain Springs Summit Mountain Springs Summit Mountain Springs Summit [el. ] is a mountain pass in the Spring Mountains of Southern Nevada in the United States. The pass is on the summit of a ridge in the Spring Mountains between the Mount Charleston area and the rest of the Mojave Desert and is located on the border of the Humboldt-Toiyabe National Forest and Red Rock Canyon National Conservation Area. The pass connects the Pahrump Valley with the Las Vegas Valley, and it is traversed by State Route 160. The Old Spanish National Historic Trail went through the pass and along the center-south of