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Why do so many people trek around Mont Blanc?
There could be many reasons for that, but the best answer is that it is a great trek. Let it be said though, that it is hard. You gain and lose 500-1000 meters of elevation every day. Staying at the huts is nice, and the food they serve is great. You can go organized, or you can do it on your own.
Feel free to check out my short video from when I did the trek long time ago.