Aerial panorama of the city of Porto with the Ponte de Dom Luis I (bridge) that carries a tram service on the upper deck in the foreground. The Dom Luís I (or Luiz I) Bridge is a double-decked metal arch bridge that spans the Douro River between the cities of Porto and Vila Nova de Gaia in Portugal. At the time of construction its span of 172 m was the longest of its type in the world.
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