View of the Dom Luis I bridge over Douro River aligned with colourful buildings at sunset, UNESCO World Heritage Site, Porto, Norte, Portugal, Europe

photography panoramic color image travel destinations travel outdoors sunset dusk no people portugal europe douro river river water dom luis i bridge bridge architecture city urban scene building porto cloud sky rooftop sunshine sunlight boat dramatic sky travel destination tourist destination tourist destinations sunny sundown evening twilight skies rivers flowing water outdoor outside nobody no one no person cities urban buildings bridges connection connections nautical vessel nautical vessels transport transportation architectural