Dam of El Atazar Monument · El Berrueco, Sierra Norte, Madrid Built between 1965 and 1972, it is a double-curvature arch dam 134 metres high above its foundations with a 484-metre crest, with more than eight kilometres of internal inspection galleries and a complete monitoring system. Photo: No machine-readable author provided. Pavlemadrid commons assumed (based on copyright claims). (CC BY 2.5) What to see and do in El Berrueco