Roman bridge crosses river, view down historic brick work, aerial pan

roman bridge crosses river down historic brick work aerial pan san xoan de rio navea bridge mino sil valley middle ages ourense galicia spain antonino via nova antonine itinerary geira roman road leafless barren scraggly bracara augusta asturica augusta roman mile astorga braga establish overview vespasian titus commercial purpose julius milestones mansio post station lodging route conserve historical old stone architecture space for text copy space