The Roman bridge of Lugo spans the Miño river on the southern edge of the old town, a 104-metre crossing built during the first century AD to carry the main road south toward what is now Portugal. It is one of the few Roman bridges in Spain that still carries foot traffic across a working river. The bridge was restored in the Middle Ages and again in the early modern period, though its foundations remain largely original.
Since 2012, the bridge has been closed to vehicles and converted to pedestrian use, with the asphalt and metal fencing removed to restore something close to its Roman appearance. A walk across it is part of any serious visit to Roman Lugo — the views up and down the Miño valley from the parapet are worth the detour even if you're not especially interested in ancient engineering. The bridge also forms part of the Camino Primitivo, the oldest route of the Camino de Santiago, which passes through Lugo on its way to the coast.