This is the so-called Landwasserviadukt near Filisur – one of those famous architectural monuments of the Rhätische Bahn (RhB) built in the pioneering days of the Swiss railways in the canton of Graubünden.

I made this photo in Summer 2023, on August 2nd, and I was traveling alone that day, because I had to spend quite a lot of time on it (sitting on the bench you can see at the lower right edge of the picture and waiting for the next train, again and again and again)...
You can get more information on that day's bold venture in my Diary if you want to.

S20