The Cave of la Mora, Somaén Nature · Arcos de Jalón, Tierra de Medinaceli, Soria Image of Arcos de Jalón, not of the place itself. Carbon-14 dating places the occupation of this cavity around 2600 before Christ, between the Eneolithic and the Bronze Age: some 4,600 years of human presence in the canyon of the Jalón. Photo: José Ibáñez (CC BY 3.0) What to see and do in Arcos de Jalón