There are literally hundreds of Roman bridges in Galicia, many used by or adjacent to the Camino Portuguese.

Some of these are more recent constructions on the Roman-engineered foundations, but with other the literal stones of the bridges date back millennia. The Oronelle Bridge, shown below, was built by the Romans, and is still quite usable,

It’s amazing to see the grooves in the stones worn by cart wheels and foot tread over the vast span of years!