Historic ensemble of Patones de Arriba Monument · Patones, Sierra Norte, Madrid A hamlet built entirely of slate slabs, the foremost example of what is known as the black architecture of Madrid. It was left empty when its inhabitants moved down into the valley and was restored afterwards; it has been listed as a Bien de Interés Cultural (Spain's highest level of heritage protection) since 1999. Photo: Titozeus (CC BY-SA 3.0 es) What to see and do in Patones