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The central summit of the mighty Aiguille du Midi massif is 3,777 m above sea level. Just below its summit, at an altitude of 3,700 m, there is an observation deck in the form of a steel gallery, 32 m long, which completely surrounds the summit. It has glass walls and a floor, which allows you to look down a cliff that is over 1000 meters deep. A modern cable car leads to the top.