Cave of el Demo Nature · Boal, Eo-Navia, Asturias Image of Boal, not of the place itself. A natural cave located next to the settlement of Froseira, in the parish of Doiras (municipality of Boal, Asturias), at about 450 metres of altitude and reached by a steep two-kilometre path. It is the only cave site in western Asturias with prehistoric art: engravings and paintings of animal and human figures dated to the second half of the Bronze Age, between 1500 and 1100 BC, with schematic anthropomorphic and zoomorphic drawings. It was declared a Bien de Interés Cultural del Patrimonio Histórico de Asturias (Spain's highest level of heritage protection) and is included in the Proyecto del Parque Histórico del Navia. Once used as shelter for livestock and as a refuge during the Civil War, it now remains closed to the public. Photo: Stewie Griffin (Public domain) What to see and do in Boal