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Porto Train Station. The Inside Of The Porto, Portugal, Central Train Station. Porto Is The Second-Largest City In Portugal. It Has A Population Of 237,000, The Metropolitan Area, However, Includes An Estimated 2 Million People. Located On The Douro River Porto Is One Of The Oldest European Centers. It Is Registered As A World Heritage Site By Unesco Since 1996. Porto’S Settlement Dates Back To Roman Times, When It Was An Outpost Of The Roman Empire. One Of Portugal's Internationally Famous Exports, Port Wine, Is Named After Porto.