Attention Spans: Iconic American bridges
Some of the world's most impressive bridges are located right here in the United States
There are nearly half a million bridges in the United States, and people rely on them on a daily basis to cross obstacles like rivers, valleys, gorges, and railroad tracks.
Over and above its practical worth, a bridge is also an important architectural statement, and the nation can boast some truly remarkable and historic structures.
How many bridges have you crossed? Scroll through the gallery and find out how good your attention span is.
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