First of all it's cold as H*** !!! make sure you prepare everything, not only thick jacket and thick socks, but do prepare something for your lips and ears.
And since it's in higher elevation...as you might have already known...it will probably make you feel dizzy-ish (AT LEAST FOR ME), so I dont know, prepare something for that too.
Other than that, GOSH it is breathtaking!!! (literally and figuratively), it's beautiful, top-notch, unforgettable experience. The scene was something to die for. I can't really describe it but go for a visit!
You are getting into the cable car twice before you get to the top, even then the scene was already unbelievable enough it kinda make you realise how small you are in this world.
They do have a place that sells food, nothing really fancy but good enough, baguette sandwiches, bruschetta, i forgot what was it called huge round sandwiches, gratin; tartiflette... or if you could hold your stomach, go for the various bistros / brasseries down in chamonix
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