Built in 1886 the Dom Luis I bridge, spanning approx. 400 metres across the Duoro river in Porto, conveying light rail, general traffic and pedestrians over two levels appears to be way ahead of it’s time. Both decks are suspended by a central arch of 173m in diameter. Originally used as a toll bridge, which changed in 1944, when the bridge was incorporated into the City infrastructure.
……..the journey continues………….
4otomo 
Great photos!
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