Spring of Piedra de Guadarrama Monument · Guadarrama, Cuenca del Guadarrama, Madrid Built in 1785, in the reign of Charles III, with irregular granite ashlars, it served as a watering place and water point on the Camino Real de Castilla, the route linking Madrid with the northwest of the Peninsula via the Guadarrama pass. Photo: Dirección General de Turismo. Consejería de Economía e Innovación Tecnológica. Comunidad de Madrid. (CC BY 3.0 es) What to see and do in Guadarrama