A bridge is a structure built to span a gorge, valley, road, railroad track, river, body of wate, or any other physical obstacle, for the purpose of providing passage over the obstacle. Designs of bridges will vary depending on the function of the bridge and the nature of the terrain where the bridge is to [...]
Looking across the East River from Empire-Fulton Ferry State Park, Brooklyn, New York. To the left, the Brooklyn Bridge; to the right, the Manhattan Bridge. Credit Randy Wick
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