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Located along the Douro River estuary in northern Portugal, Porto is one of the oldest European centers, and its core was proclaimed a World Heritage Site by UNESCO in 1996, as “Historic Centre of Porto, Luiz I Bridge and Monastery of Serra do Pilar”. The airport is located 11 km (6.8 mi) northwest of the Clérigos Tower in the center of Porto, in the municipalities of Maia, Matosinhos and Vila do Conde and is run by ANA – Aeroportos de Portugal.