The slate of Bernardos Curiosity · Bernardos, Comunidad de Ciudad y Tierra de Segovia, Segovia Bernardos was for centuries a producer and exporter of slate, used both in ordinary building and in monuments; the same rock that sustains its economy served as material for the late Roman wall of the Cerro del Castillo. Photo: Lourdes Cardenal (CC BY-SA 4.0) What to see and do in Bernardos