`step into the void` glass box on the aiguille du midi 3842m mountain top above chamonix

3842m adventure aiguille alpine alps altitude architecture attraction background beautiful blanc blue box building chamonix cold destination europe european extreme france french glacier glass haute high into landmark landscape massif midi mont montblanc mountain nature nobody outdoor panorama people platform popular portes recreation rock room savoie scary scenic skywalk soleil spectacular step summer the top tourism tourist travel vacation vertical viewpoint void