The centre of the necropolises of the Alto Arlanza Activity · Palacios de la Sierra, Sierra de la Demanda, Burgos Image of Palacios de la Sierra, not of the place itself. Opened in 2011, this interpretation centre explains the anthropomorphic tombs cut into the sandstone that are scattered across the hills of the upper Arlanza and the early medieval settlement that left them. Photo: No machine-readable author provided. Victoryustalaguna assumed (based on copyright claims). (CC BY-SA 3.0) What to see and do in Palacios de la Sierra