The Roman bridge of Córdoba was originally built in the early 1st century BC across the Guadalquivir river, though it has been reconstructed at various times since. Most of the present structure dates from the Moorish reconstruction in the 8th century.
Currently, after the Islamic reconstruction, has 16 arcades, one fewer than originally, and a total length of 247 meters. The width is around 9 meters.
The Via Augusta, which connected Rome to Cádiz, most likely passed through it. During the early Islamic domination the Muslim governor Al-Samh ibn Malik al-Khawlani ordered a bridge to be built on the ruins of what was left of the old Roman construction. In the Middle Ages, the Calahorra Tower and the Puerta del Puente were built at the bridge's southern and northern ends, respectively (the latter is now a 16th-century reconstruction). The bridge was reconstructed and expanded to its current size. The arches depict the famous Moorish architecture that dominates the city's scenery. In the 17th century, a sculpture depicting St. Raphael was put in the middle of the bridge, executed by Bernabé Gómez del Río.
During its history, the bridge was restored and renovated several times (in particular in the 10th century), and now only the 14th and 15th arches (counting from the Puerta del Puente) are original.References:
The Arch of Constantine is situated between the Colosseum and the Palatine Hill. It was erected by the Roman Senate to commemorate Constantine I's victory over Maxentius at the Battle of Milvian Bridge in 312. Dedicated in 315, it is the largest Roman triumphal arch. The arch spans the Via triumphalis, the way taken by the emperors when they entered the city in triumph.
Though dedicated to Constantine, much of the decorative material incorporated earlier work from the time of the emperors Trajan (98-117), Hadrian (117-138) and Marcus Aurelius (161-180), and is thus a collage. The last of the existing triumphal arches in Rome, it is also the only one to make extensive use of spolia, reusing several major reliefs from 2nd century imperial monuments, which give a striking and famous stylistic contrast to the sculpture newly created for the arch.
The arch is 21 m high, 25.9 m wide and 7.4 m deep. Above the archways is placed the attic, composed of brickwork reveted (faced) with marble. A staircase within the arch is entered from a door at some height from the ground, on the west side, facing the Palatine Hill. The general design with a main part structured by detached columns and an attic with the main inscription above is modelled after the example of the Arch of Septimius Severus on the Roman Forum.