Chamonix includes the highest mountain in Western Europe – Mont Blanc (almost 16,000 feet). The Mont Blanc Massif has 27 peaks that are higher than 13,000 feet. They offer many alpine routes on granite rock. Most climbers, though, are attracted to the huge granite towers and spikes to the left of the Aiguille de Midi. Some of the routes take days to finish. Accessing some of the most awesome walls requires moving over glaciers.