bdhsfz6
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I grew up just a 45 minute drive from the Starrucca Viaduct. I've read and heard folks talk about it but just recently decided to go see it for myself.
When it was completed by the Erie RR in 1848, it was the largest & most expensive stone arch bridge in the world.
en.wikipedia.org
The blue stone was quarried locally and the quality of workmanship is still evident today:
To me, the most impressive fact about the viaduct is that it has been in continuous operation for 175 years requiring very little maintenance.
When it was completed by the Erie RR in 1848, it was the largest & most expensive stone arch bridge in the world.

Starrucca Viaduct - Wikipedia
The blue stone was quarried locally and the quality of workmanship is still evident today:
To me, the most impressive fact about the viaduct is that it has been in continuous operation for 175 years requiring very little maintenance.