The view over the Douro River looking towards the Ribeira district of Porto, UNESCO World Heritage Site, Porto, Portugal, Europe

travel destinations porto portugal europe unesco unesco world heritage site douro river river water ribeira outdoors day incidental people city urban scene cityscape boat clear sky sky building exterior building boats nautical vessel nautical vessels transport transportation building exteriors architectural exterior architectural exteriors architectural buildings cities urban cityscapes urban scenes daytime outdoor outside rivers flowing water travel destination tourist destination tourist destinations travel world heritage site