The little village of Elm lies way up at the top in Sernf Valley (Glarus), which is separated from Flims (Graubünden) by the prominent Tschingel Horns, part of the UNESCO World Heritage Site "Swiss Tectonic Arena", a place where once upon a time older rock layers pushed themselves up over younger rock layers. People have been fascinated by the natural phenomenon of the sun-hole in the rock face for hundreds of years. It gave rise to the legend of heroic Martin and the evil Giant - the hole was punched out when they fought.
To this day, the 22x19meter wide rock window and the sun appearances and phenomena it creates, intrigue people. Even astronomers are fond of making a pilgrimage to Elm on March 13 and 14, and on September 30 and October 1. The moon too is visible in the Martin's Hole at certain intervals.
The careful planning of a tour will ensure that you also derive the maximum pleasure and enjoyment from it. Please take the time to contact the local information centre and enquire about route and weather conditions before setting off. Your intended trail may be fully or partially closed, depending on the time of year and weather conditions.