There are more than 600,000 bridges in the United States. Take a look at some of the most stunning bridges...
1. Leonard P. Zakim Bunker Hill Memorial Bridge
The Leonard P. Zakim Bunker Hill Memorial Bridge over the Charles River was named to honour Zakim's civil rights and race relations work in Boston.
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Highway bridge
Kayakers and paddle boarders watch as the Space Shuttle replica "Explorer" moves under a highway bridge into Clear Lake toward the dock at the Johnson Space Center in Houston.
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Pat Tillman Memorial Bridge
The Mike O'Callaghan-Pat Tillman Memorial Bridge is an arch bridge in the United States that spans the Colorado River between the states of Arizona and Nevada.
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New River Gorge Bridge
The New River Gorge Bridge in Fayetteville, West Virginia is a steel arch bridge opened in 1977.
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Golden Gate Bridge
The sun sets near the Golden Gate Bridge before a fireworks show during the 75th anniversary celebration of the iconic span in San Francisco, California.
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Sundial Bridge
The Sundial Bridge (also known as the Sundial Bridge at Turtle Bay) is a cantilever spar cable-stayed bridge for bicycles and pedestrians that spans the Sacramento River in Redding, California, United States.
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Brooklyn Bridge
The Brooklyn Bridge is seen before the lights are turned off, in participation with Earth Hour in New York.
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Sachs Covered Bridge
The Sachs Covered Bridge was built around 1854 at a cost of $1,544.
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Bixby Bridge
Bixby Bridge, is a reinforced concrete arch bridge in Big Sur, California.
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Margaret Hunt Hill Bridge
The structure, a link between downtown Dallas and its western flank, an area known as West Dallas that has become a depressed, lower-income part of the city, is part of the Trinity River Project.
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Bridge on Multnomah Falls
Multnomah Falls is a waterfall on the Oregon side of the Columbia River Gorge, located east of Troutdale, between Corbett and Dodson, along the Historic Columbia River Highway.
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Verrazano-Narrows Bridge
Space Shuttle Enterprise rides atop a NASA modified 747 plane flies over the Verrazano-Narrows Bridge in New York.
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Runners cross the Verrazano bridge as they compete in the 2011 New York City Marathon in New York.
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Clark Fork River bridge
A truck is driven across a one-lane bridge across the Clark Fork River in Noxon, Montana.
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Susquehanna River bridge
A railway bridge over the Susquehanna River is seen in Harrisburg, Pennsylvania.
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The esplanade offers views of Washington DC landmarks.
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The complex consisting of the ports of Los Angeles and Long Beach are among the world's busiest.