Dehesa Boyal of Collado Villalba Nature · Collado Villalba, Cuenca del Guadarrama, Madrid Image of Collado Villalba, not of the place itself. Ash grove of communal pasture with roots documented in the late 13th century and some 78 hectares, of which 58 are still used for livestock; an accessible 3.2-kilometre circular route with fourteen panels runs around its perimeter. Photo: Pepeese (CC BY-SA 3.0) What to see and do in Collado Villalba