On leaving Tarragona, for a trip through the mountains of Catalunya and Aragón, the first order of business is to stop at the Ferreres Viaduct.

The top channel and parapet has been repaired – I saw a lone jogger cross it and so took the hint and walked across myself – but the rest is pretty much as it would have been in the 1st Century. A sign board shows what it might have looked like half- complete, with massive scaffolding and block-and-tackle machinery in place, but still the whole thing is hard to believe. You understand why the people who came along in the 5th-7th centuries might have believed in a vanished race of giants. The board had a proud quote from a Roman aqueduct inspector, Fronti, to the effect that “our pyramids are actually useful.”

K here. Below is a pic with R underneath for scale.