Dom Luis Bridge, which connects the Town of Santa Marinha (Vila Nova de Gaia) in Porto, the Douro River, was built beside the site where once stood the old suspension bridge has two decks supported by an imposing iron arch and five pillars.The arch is formed by two parabolic curves diverge. The upper deck is based on meetings and stonework on the three pillars on each bank of the River. In total 3000 were spent tons of iron, and 172 meters of them are 45 meters of rope and are an arrow components of the arch of the bridge.
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