Spain

Roman Bridge at Cangas de Oni­s
This is the Roman Bridge or Puente Vieyu at Cangas de Oni­s, which was once the capital of the Kingdom of Asturias. It dates back to medieval times, possibly to the 13th century, and has a reproduction of the famous Victory Cross (incorporated on the flag of Asturias below) hanging from the central arch. The original is a work of precious metal dating to the start of the 10th century that is kept in Oviedo Cathedral.
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Flag of Asturias