Via Sett: Ein rätselhafter Stein

Below the path you will see a flat stone with two bowl-shaped depressions - presumably it is not by chance that it is located in this place! There are many shell stones in Switzerland, but their origin is usually unclear. 

In the audio contribution , Mr. Cantieni, who worked in the archive in Bivio for 30 years, tells you what significance he suspects behind the stone.