Gardens of the Palace of Villena Monument · Cadalso de los Vidrios, Sierra Oeste, Madrid A 16th-century Renaissance garden laid out behind the palace of the Marquis of Villena, with a large stone pond ringed by a walkway, viewpoints and pavilions; it is listed as a Bien de Interés Cultural (Spain's highest level of heritage protection) together with the palace itself. 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 Cadalso de los Vidrios