View over Douro River towards Dom Luis I Bridge, Porto, Portugal, Europe

travel destination photography horizontal colour image europe clear sky blue outdoors day building exterior bridge architecture portugal portuguese culture river water porto douro river national landmark old the past history dom luis i bridge arch metal 19th century elevated view incidental people places of interest colour color image color outdoor outside tourist destination travel architectural background people people in the background historical historic heritage cultural culture arches arched typically portuguese traditional culture tradition traditional traditionally portuguese european