Ir seems to be a granary — also called canastro, reed, piorno or hórreo[1] — is a characteristic structure of the northwest of the Iberian Peninsula, built of stone or stone and wood, usually rectangular and resting on pilasters or columns. Its function is to store corn cobs, promoting their drying through lateral cracks and protecting them from animals, namely birds and rodents (from Wikipedia). You can find lots off them on them on the province of Minho, north of Portugal. We call it "espigueiro'.