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Porto is the second-largest city in Portugal after Lisbon and one of the major urban areas of the Iberian Peninsula.
Located along the Douro river estuary in Northern Portugal, Porto is one of the oldest European centres, and its historical core was proclaimed a World Heritage Site by UNESCO in 1996.
The grandiose Dom Luís I bridge is one of the most iconic structures in Portugal. This is a double-deck metal arch bridge that spans the River Douro between the cities of Porto and Vila Nova de Gaia in Portugal. In 1879, Gustave Eiffel presented a project to construct a new bridge over the Douro, with a single deck in order to facilitate navigation.