When the Kinzua Viaduct was built in Pennsylvania in 1882, it was the longest and highest viaduct in the world.In 1900 it was rebuilt to carry heavier trains, using 3,175 tons of steel and 895,000 rivets.In 2003, a tornado destroyed 11 of the 20 towers and it was decided that the remaining towers would be used to support the Skywalk.The Skywalk extends 624 feet (190 meters) into the Kinzua Gorge and glass panels allow visitors to peer into the gorge below.
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