Hillfort of las Merchanas Nature · Lumbrales, Vitigudino, Salamanca Eight and a half hectares of fortified settlement on a granite promontory in a meander of the river Camaces, inhabited from the 2nd century before Christ to the middle of the 5th century of our era. It lies inside the natural park of Arribes del Duero. Photo: Raulvmorgado (CC BY-SA 3.0) What to see and do in Lumbrales