The Golden Gate Bridge, which spans the San Francisco Bay and connects the city to its northern suburbs, is one of the world's most famous structures. Its construction 78 years ago over a deep, treacherous channel was a marvel of modern engineering. In this photo, pedestrians walk across the bridge on May 27, 1937 -- one day before it opened to vehicular traffic. Click through to see other photos of the bridge's construction and grand opening.
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