Walk across the longest covered bridge in America in the Midwestern state of Indiana while enjoying the structure's ...

(Connor Greco/Daily Freeman) The Millbrook Bridge is one of three historic covered bridges in the town and five in Ulster County, giving a glimpse into transportation methods of the past.

The Problem with America's BridgesThere are about 473,440 bridges across the country, excluding culverts and bridges in U.S. territories. Experts say the average age of a bridge is about 47 years old.