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It Took Three Years to Build Bethlehem Steel's Headquarters. It Was Demolished in Seconds.

Crews used nearly 500 pounds of explosives to implode the 21-story building, which was felled in seconds. 

"It's the end of an era, and I'm going to miss seeing it there," Mike Gentilcore, a former Bethlehem Steel researcher, told the Associated Press. 

You can watch the implosion here and here.