Town Hall of Castelnou Monument · Castelnou, Bajo Martín, Teruel Image of Castelnou, not of the place itself. The town hall of Castelnou occupies one side of the plaza de la Villa, surrounded by a garden of mulberry trees and facing the trough through which flows the water that irrigates the village's market gardens; its coat of arms shows a medieval castle with the initials C and N beneath the Aragonese royal crown. Photo: B25es (CC BY-SA 4.0) What to see and do in Castelnou