They were climbing Montblanc when they decided to take this photo more than 130 years ago. Do an image search on Google and you’ll see it on lots of websites, though most of them don’t list a date for the photo.
One claims the photo was made in 1820 which, if you know the history of photography, is clearly impossible.
A second website says 1870. A third website says 1890. Those dates sound about right to me.
Here are my questions: Who took the photo and where were they standing? And who decided it would be a good idea to lug one of those big, wooden box cameras up the side of an icy mountain?