© All Rights Reserved The 1876 Dona Maria Pia bridge in Porto. Designed by Gustave Eiffel, the bridge is the only one of the six bridges spanning the Douro that is not usedRelated images Ponte da Arrabida - Porto Capela do Senhor da Boa Nova Pergola da Foz Ornate Facade - Porto Cais do Marégrafo Foz - Porto Igreja Paroquial de Massarelos