12. Seven Mile Bridge, Florida
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The Seven Mile Bridge delivers vast seascape views of the Gulf of Mexico and Atlantic. Stretching 6.79 miles (10.9 kilometers), it ranks among the world's longest and anchors the Overseas Highway.
Finished in 1982, it replaced an earlier span whose remnants remain. Photographers and nature watchers relish sightings of dolphins, turtles, and birds. In severe storms it closes for safety.
