The Royal Gorge bridge, Canyon City, Colorado ... Original pinner said: America’s highest suspension bridge nearly 90 stories at the Arkansas River below. Completed in 1929, the bridge didn't have stabilizing wind cables until 1982.
Gallery of The Ten Most Impressive Engineering Projects of All Time - 3
Infographic: America’s Crumbling Infrastructure....CFC...There is enough blame to go around, from corporations not maintaining there property to politicians pandering to the no tax base...but in the end we all lose.
The longest bridge in the world, The Lake Pontchartrain Causeway, is a causeway composed of two parallel bridges crossing Lake Pontchartrain in southern Louisiana, United States. The longer of the two bridges is 23.83 miles long. (Wikipedia)