Rabelo boats on the Douro River, UNESCO World Heritage Site, Porto, Norte, Portugal, Europe

rabelo boats douro river porto portugal colorful buildings unesco heritage history culture norte river transport traditional boats waterfront scenic view architecture riverbank tourism travel sightseeing historic site vibrant city landscape waterway exploration maritime local heritage fishing boats river cruise picturesque cultural landscape portuguese architecture riverside old town urban scenery adventure scenic river city views traditional culture boat tour riverside dining local traditions historical buildings morning light waterfront scene colorful facades river life scenic backdrop cultural exploration charming streets riverside activity