Enjoy history and glaciology It takes about twenty minutes to climb the 1,000 metres up to the Montenvers-Mer de Glace attraction. Simply hop on board the famous little red railway train. Time will stand still, and you’ll enjoy this vintage method of transport. The track climbs the mountainside, running through the forest, tunnels cut through the rock and over viaducts. You enter the realm of the high mountains, and round the last bend you’ll feel the magic: you’ve arrived at your destination at the foot of the famous Mer de Glace glacier, at an altitude of 1,913m. A stunning panorama opens out before you, with the glacier below, an excellent testament to the climate change in this day and age.