Stock Photo - Porto, Porto District, Portugal. View across Douro River from Vila Nova de Gaia to Ribeira district. Boats like this one with tourists enjoying a trip on the river are called barcos rabelos. Once they transported port wine on the river but are now used for excursions. Porto is known as Oporto in English. The historic centre of the city is a UNESCO World Heritage Site.

Stock Photo: Porto, Porto District, Portugal. View across Douro River from Vila Nova de Gaia to Ribeira district. Boats like this one with tourists enjoying a trip on the.

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