Palaeolithic tools of the Eria terraces Historical milestone · Castrocalbón, La Bañeza, León Image of Castrocalbón, not of the place itself. The highest alluvial terraces of the Eria valley, in Castrocalbón, have yielded stone tools between two hundred thousand and three hundred thousand years old, today distributed among the Museo Provincial de León, the University of León, and the local museum. Paleolítico Inferior Photo: Antramir (CC BY-SA 3.0) What to see and do in Castrocalbón