Porto, Portugal, Unesco Heritage Site, old city houses and Douro river with boats during blue hour evening timelapse

ribeira douro river oporto porto rio douro douro panoramic river panorama timelapse riverbank dom luis i bridge town cloudy sky time lapse city skyline bridge portugal embankment clouds sky sunrise cityscape sky blue hour world heritage site downtown unesco europe european urban destination building travel water portuguese landmark tourism old day historic architecture dom historical architectural colorful traditional luis