Tower of Proaza Monument · Proaza, Oviedo, Asturias A cylindrical tower of rough ashlar with four floors, arrow slits and a raised entrance reached by a drawbridge, built to watch over the Trubia valley. Declared a monument in 1965, it is the most recognisable civil building in the municipality. Photo: Adolfobrigido (CC BY-SA 3.0 es) What to see and do in Proaza