There are many magnificent bridges around the world. Some of the bridges are for pedestrians. Some are for automobiles. Then you have those magnificent railroad bridges.

Welcome to the town of Nicholson, Pennsylvania, a small town in the northeastern region of the U.S. state of Pennsylvania. What is so great about this town? When you visit this small town, you will notice an amazing engineering marvel. This marvel is the Tunkhannock Viaduct. (It is also known as the Nicholson Bridge getting the name from the town and the Tunkhannock Creek Viaduct from the creek this bridge crosses.) As you stare at the bridge, you will be amazed at huge arches on the structure. You will not be thinking that it has been said that it is the largest concrete bridge in the United States of America and possibly the world, and you will not be thinking that this bridge is…