Ancient communication route between the villages of Caín (León) and Poncebos (Asturias). It was rather a goat path, where the way was complicated and sometimes disappeared completely. At the beginning of the 20th century, from 1945 to 1950, the path was improved to build water channelling and supply the Poncebos hydroelectric power station. Lots of workforce and hard-work were necessary in order to manage to dig a path into the rock. It is a very craggy place (terreno escarpado, si es montañoso) / a very steep place with a severe weather. In the present time we can enjoy its amazing landscapes with much less effort.