Douro River and Ribeira district, UNESCO World Heritage Site, Porto, Portugal, Europe

travel destination photography horizontal colour image europe outdoors day building exterior unesco unesco world heritage site architecture portugal portuguese culture river water porto ribeira district douro douro river large group of people men women full length ship boat transportation elevated view side view city urban scene blue ribeira colour color image color outdoor outside tourist destination travel architectural group transport unesco world heritage sites world heritage site world heritage sites cities typically portuguese traditional culture tradition traditional traditionally portuguese european