Historic ensemble of Valderas Monument · Valderas, Esla-Campos, León A medieval street plan on a hill beside the River Cea, with armorial mansions and houses of adobe and rammed earth. It preserves two arches of the first wall and was declared a Bien de Interés Cultural (Spain's highest level of heritage protection) in 2008. Photo: Lourdes Cardenal (Wikimedia Commons) (CC BY-SA 3.0) What to see and do in Valderas