Barranco de Herques Historical milestone · Fasnia, Tenerife - Abona, Santa Cruz de Tenerife Image of Fasnia, not of the place itself. A ravine of great archaeological interest whose caves have yielded Guanche mummies and objects such as the well-known Guatimac idol, evidence of the occupation of this territory by the old menceyato of Abona. Photo: Jose Luis Espinosa (CC BY-SA 3.0) What to see and do in Fasnia