The prehistoric rock carvings at Crap Carschenna, situated high above the unpronounceable village of Sils im Domleschg, were first discovered in 1965 during tree clearing prior to the construction of electricity pylons. For those able to read German, the definitive paper is that by Urs Schwegler: Felszeichnungen in Graubuenden; Helvetia Archaeologica, 1997, 111/112 pp 76-147.