Sunset over Ribeira district and the River Douro with Rabelos, UNESCO World Heritage Site, Oporto (Porto), Portugal, Europe

horizontal color image travel destinations travel outdoors sunset dusk porto portugal europe river douro river water oporto no people building exterior building architecture city urban scene cloud rabelo boat boat cargo boat transportation barrel past history unesco world heritage site unesco boats nautical vessel nautical vessels transport cities urban colour image color colour sundown evening twilight nobody no one no person outdoor outside rivers flowing water travel destination tourist destination tourist destinations