Remains of the Torre-roja Monument · Torroja del Priorat, Priorat, Tarragona Remains of the Torre Roja, a watchtower built by the Arabs in the 10th century, in the municipal area of Torroja del Priorat (Priorat, Tarragona). Its name gave rise to that of the municipality, whose place name comes precisely from it. Today only small traces of the original construction survive. Photo: Mª África (CC BY-SA 2.0) What to see and do in Torroja del Priorat