Mer de Glace
A cogwheel train leaves from behind the main train station to Montenvers station and the mighty Mer de Glace glacier. It’s a great hike as well, but you can easily take the train to the top, and then a short cable car down to the glacier. Every year a tunnel is carved into the glacier, and it’s always fun to walk inside (there is an entrance fee) and see the blue ice up close. There is also a restaurant and natural history and mineral displays at the top.