Bridge of el Descalzo Monument · Cercedilla, Cuenca del Guadarrama, Madrid Single-arched bridge over the river of La Venta, in the Fuenfría valley, long held to be Roman; today it is attributed, like the Reajo and Enmedio bridges, to the 18th-century Bourbon road. Photo: Miguel303xm (CC BY-SA 3.0) What to see and do in Cercedilla