The older of Redondela's two great railway viaducts, the Viaduct of Madrid was completed in 1876 and declared a site of Cultural Interest in 1978. Its 15 stone arches carry the Vigo–Ourense main line high above the town, and the effect from below — especially when a train rumbles across — is genuinely dramatic. The viaduct gives Redondela its nickname, A Vila dos Viaductos.
The best view is from the Alameda park below, or from the nearby streets where the arches frame the ría in the distance. Both viaducts are lit at night, making the walk along the old town atmospheric after dark.