The sentence "War is the father of all things" is attributed to Heraklit. Well, this thing was clearly a product of peace.
The small villages on the south slope of the bernese alps in the Valais valley had a problem. They had lots of sun but no water. The water coming from the glaciers ran through deep gorges and gullies. Already in the middle ages people started to channel the water along the steep gorge walls to their villages. Most of those "bisses" are simple trenches, but some were wooden constructions hung into steep or even overhanging walls. You can see the former course where it is not covered by rockfall.
The Bisse de Savièse Torrent-Neuf was built from 1430 to 1448 and was in service until 1934. 500 years of constant and dangerous fight against heavy rockfall on narrow wooden planks. Since 2005 it was partly reconstructed and made a hiking trail with some suspension bridges avoiding the most dangerous parts.
The suspension bridge was edited out in this panorama, an homage to Andrew Bodrov, who did the first of this kind of panoramas and which should be named Flying Andrew henceforth: https://www.360cities.net/image/gigapixel-solden-james-bond-007