Roman engineers built the original bridge in the early 1st century BC, probably replacing a wooden predecessor. It would have been a utilitarian structure -- the Romans built bridges to last, but the Guadalquivir's floods tested even their engineering. When Muslim forces took Cordoba in the 8th century, the bridge was in ruins. Al-Samh ibn Malik al-Khawlani, the Umayyad governor, ordered it rebuilt on what remained of the Roman piers. The Islamic reconstruction gave the bridge 16 arcades -- one fewer than the original -- spanning 247 meters with a width of about 9 meters. The arches bear the visual stamp of Islamic architecture, their profiles and proportions distinct from Roman precedents. Today, most of the visible structure dates from this 8th-century rebuilding, though only the 14th and 15th arches, counting from the Puerta del Puente on the north end, remain truly original.

The bridge never stood alone. At its southern end, the Calahorra Tower was built in the Middle Ages to control access from the far bank. At its northern end, the Puerta del Puente -- the Gate of the Bridge -- served as the formal entrance to the city, though its current form is a 16th-century reconstruction of the medieval original. Together with the bridge itself, these three structures were declared a Bien de Interes Cultural in 1931 and collectively inscribed as a World Heritage Site in 1984. In the 17th century, a sculpture of Saint Raphael, Cordoba's patron saint, was placed at the midpoint of the bridge by the sculptor Bernabe Gomez del Rio, adding a Christian marker to a crossing that had served Roman polytheists and Muslim monotheists for centuries before.

On May 1, 2004, the bridge was closed to vehicular traffic and given over entirely to pedestrians, after the Miraflores Bridge was completed nearby in 2003. A more ambitious restoration followed in 2006, directed by the municipal architect Juan Cuenca Montilla and budgeted at 13.6 million euros. The work was controversial. Pink granite replaced the old paving, polished to a gleam that some critics felt was too modern for a structure this ancient. The starlings -- the pointed projections that protect bridge piers from debris -- were cleaned to reveal their original brickwork. Nineteenth-century street lights gave way to bollard lighting. A niche dedicated to Saint Acisclus and Saint Victoria was refurbished. The restored bridge was inaugurated on January 9, 2008, but the debate over how to preserve something this layered -- Roman bones, Islamic skin, Christian ornament -- continues to reflect the broader tensions of Cordoba itself.

Walking across the bridge today, you occupy the exact path that connected Cordoba to the outside world for most of recorded history. The Mosque-Cathedral rises to the north, its mass visible above the rooftops. The Calahorra Tower waits to the south. The Guadalquivir moves beneath you at its own unhurried pace. The bridge has been repaired, rebuilt, restored, and pedestrianized, but the fundamental experience -- stepping out over moving water between two landmarks of incompatible civilizations -- is unchanged. It remains the simplest and most powerful way to understand Cordoba: a city defined by the layers of people who crossed this river.