The marble of Montesclaros in the fountains of Madrid Curiosity · Montesclaros, Sierra de San Vicente, Toledo Image of Montesclaros, not of the place itself. The municipality's quarries supplied the marble chosen in the time of Charles III for the Madrid fountains of Cibeles and Neptuno, designed by Ventura Rodríguez. Photo: Wikipedia / Wikimedia Commons (CC BY-SA) What to see and do in Montesclaros