The demolition of old Riaño Historical milestone · Riaño, La Montaña de Riaño, León Image of Riaño, not of the place itself. The village was demolished in July 1987 and the reservoir was closed on 31 December of that year, hours before new European environmental directives came into force; the valley and eight hamlets were left under water. 31 de diciembre de 1987 Photo: pictures Jettcom (CC BY 3.0) What to see and do in Riaño