27 Helix Bridge, Singapore Modeled after the DNA double helix that encodes the blueprints for life on Earth, the Helix Bridge is a pedestrian walkway in downtown Singapore. It was officially opened in 2010.
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10 Mackinac Bridge, Michigan Connecting Michigan’s two peninsulas, the five-mile Mackinac Bridge is the dividing line between Lake Huron and Lake Michigan. Every Labor Day, the bridge is opened to pedestrians, and tens of thousands of people converge on it to take part in the Mackinac Bridge Walk.
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