Roman Bridge of Córdoba, Spain

The long arcade of the Puente Romano lit up at dusk across the Guadalquivir, with the Mosque-Cathedral of Córdoba behind it. The Romans first bridged the river here, and the bridge has been rebuilt and repaired by every power that held the city since. Most of what you see dates from the Islamic rebuilding of the 8th century, which left 16 arches, and only two of them, the 14th and 15th counted from the Puerta del Puente, are thought to be Roman. The bulky cutwaters facing upstream are what have kept it standing through centuries of floods. The bridge has been closed to traffic since 2004, and walking it from the Calahorra Tower to the Puerta del Puente is the classic way into the old town.