View towards Vila Nova de Gaia, Dom Luis I Bridge and Monastery of Serra do Pilar, UNESCO World Heritage Site, Porto, Portugal, Europe

horizontal color image travel destinations travel outdoors day porto portugal europe river douro river water dom lu?s i bridge arch bridge bridge transportation connection architecture oporto monastery of serra do pilar vila nova de gaia monastery place of worship religion building exterior building city urban scene cloud train public transportation ferry journey boat incidental people unesco world heritage site unesco boats nautical vessel nautical vessels transport cities urban colour image color colour daytime outdoor outside rivers flowing water travel destination tourist destination tourist destinations