Pan shot of people walking through the upper level of The Dom Luis I Bridge over River Douro in Porto, Portugal at daytime

aerial drone shot people walking over bridge cycling dom luis i bridge river douro locals tourists portugal daytime architecture building city cityscape construction day dom dom luis bridge douro douro river downtown europe european famous historic historical landmark luis metal metro morning oporto pedestrians porto portuguese ribeira ribeira do porto river serra do pilar subway train tram transport transportation vila vila nova de gaia water wine rail tracks