Have you ever driven along the back roads of Pennsylvania and come across one of the state’s beautiful metal truss bridges? Or seen a massive truss bridge spanning a major river crossing? These awe-inspiring bridges are a part of Pennsylvania’s landscape and an important part of the state’s engineering and technological history. Continue reading
![](https://pahistoricpreservation.com/wp-content/uploads/2016/11/Photo-1-Holth-Upper-Slate-Run.jpg)
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