| Emilio Biel Construction of the "Ponte Maria Pia" in Porto [Portugal] [Construção da "Ponte Maria Pia", no Porto. [Weight testing]] 1877, 30 October Albumen print Private collection of Manuel Magalhaes LL/45686 The Ponte Maria Pia is a railway bridge built by Gustave Eiffel in Porto, Portugal. Construction started on 5 January 1876 and completed on 4 November 1877. At the time of construction it was the longest arch bridge in the world at 160m.
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