The Riofrío forest Nature · Real Sitio de San Ildefonso, Alfoz de Segovia, Segovia Image of Real Sitio de San Ildefonso, not of the place itself. The palace stands in the middle of an enclosed woodland of 625 hectares, once reserved for royal hunting, through which fallow deer and red deer still move freely among holm oaks and ash trees on the northern side of the Guadarrama. Photo: FDV (CC BY-SA 3.0) What to see and do in Real Sitio de San Ildefonso