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A 1,600-foot main span connects Manhattan and Brooklyn in the iconic Brooklyn Bridge, a marvel of engineering completed in 1883.
550 tons of chains support the Clifton suspension bridge, a 19th-century engineering feat designed by Isambard Kingdom Brunel.
More than 20 workers died during the construction of the Brooklyn Bridge, which opened in 1883 as the longest suspension bridge in the world.
The Golden Gate Bridge spans 1.7 miles and features towers that rise 746 feet above San Francisco Bay, making it a significant engineering achievement.