The peñas caballeras Nature · Peñacaballera, Sierra de Béjar, Salamanca Image of Peñacaballera, not of the place itself. The village's name comes from the abundance of great granite boulders resting on the ground or on other rocks on a narrow base, with an air of instability that earned them the name of peñas or balancing stones. Photo: Ramajero (CC BY-SA 4.0) What to see and do in Peñacaballera