Science & Tech
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The Upper Suspension Bridge opened in July 1869 as the longest suspension bridge in the world, with iron cables hung from timber towers. Between 1884 and 1887, the wooden bridge was changed to steel. In 1898, the steel bridge was replaced by the Upper Steel Arch Bridge.
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ExploreHere reads historical markers out loud as you pass them: over 325,000 stories across the US. No account needed.
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