Vallée de Chamonix & Mer de Glace Glacier
The Mer de Glace is France's largest glacier, stretching 7 km beneath the jagged needles of the Mont Blanc massif. A rack railway built in 1909 still hauls visitors up from Chamonix to the ice cave carved fresh into the glacier each spring.
Getting There & the Montenvers Railway
The Montenvers rack railway departs from a grand Belle Époque station just a 10-minute walk from Chamonix centre, climbing 872 metres in roughly 20 minutes through pine forest to the terminus at 1,913 m.
From the station a series of metal staircases — the number of steps increases every year as the glacier retreats — descends to the glacier surface and the sculpted ice cave, where blue light filters through walls of 100-year-old ice.
Le Tour village sits at the quieter, upper end of the valley, making it an ideal base: you avoid the Chamonix crowds yet remain within 15 km of the Montenvers departure point.
What to Expect on the Ice
Inside the cave, artists re-carve chambers and sculptures each May; the temperature hovers around 0 °C year-round so bring a layer even in July.
On the glacier surface, crampons are available to rent and a short guided walk takes you across real crevasse fields — one of the most visceral ways to understand Alpine geology.
Interpretive panels along the route document 150 years of retreat with historic photographs, turning a thrilling excursion into a quietly sobering lesson in climate change.
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