A tourist guide is seen explaining the history of this train station. Porto is Portugal's second-largest city and the capital of the Northern region, and a busy industrial and commercial center. The city is built on the high ground overlooking the Douro River estuary's northern side, and its historical center was declared a UNESCO World Heritage Site in 1996.

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Photo credit: © SOPA Images / Alamy / Afripics
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Keywords: center, heritage, historical, porto, site, tourism, tourist, tourists, unesco, world