The dark lime of Linares Curiosity · Linares de Riofrío, Sierra de Francia, Salamanca Image of Linares de Riofrío, not of the place itself. The bluish stone of the mountains was fired here in kilns fed with broom and oak for about five days. The dark lime of Linares was so famous that the mortar of the Plaza Mayor of Salamanca was made with it; in 1959 fifteen kilns still remained. Photo: Hovallef (CC BY-SA 4.0) What to see and do in Linares de Riofrío