The hillforts of Peña Castriello and Valleciudad Nature · Rosinos de la Requejada, Sanabria, Zamora Image of Rosinos de la Requejada, not of the place itself. The municipal district preserves several fortified Iron Age settlements —Peña Castriello, Valleciudad and Peñas de la Cerca— which prove a dense occupation of these valleys long before the Leonese resettlement. Photo: Valverdedelucerna (CC BY-SA 4.0) What to see and do in Rosinos de la Requejada