View across the Douro River to Ribeira traditional waterfront houses and moored tourist ships, UNESCO World Heritage Site, Porto, Portugal, Europe

travel destination photography horizontal colour image international landmark europe traditional unesco world heritage site house portugal douro river river porto water ribeira waterfront houses tourist ships cruise ship transportation outdoors building exterior architecture day portuguese culture cloudy sky side view full length men women large group of people waterfront places of interest colour color image color outside tourist destination travel architectural group transport unesco world heritage sites unesco world heritage site world heritage sites tradition traditional culture typically portuguese traditionally portuguese european