Yes, I know that Chamonix is a winter resort, however, for someone like us, used to live several years without any sign of snow (and enjoying hot weather) live the heat of summer snow in such a marvelous landscapes, was something no one could forget.
It was a very quick visit, that left us the will to return (in summer or winter...)
Mer de Glace
It's quite an experience, using the mechanical means to go up and down the mountain, and to walk several meters inside the glacier (with the advantage of being the shortest of the three rides locally offered).
Standing for the family photo is mandatory, and, though in a worry not to get frozen kids, we had time enough to appreciate the effects of light through the glace.