Image may be NSFW.
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A documentary from the early 80's on the building of the WTC towers. The 110-story towers cost $900 million to build and took almost a decade to build (1966 -1973).
In case you're curious, here is what the site looks like as of April, 2010.
http://upload.wikimedia.org/wikipedia/en/3/33/World_Trade_Center_site_2010.jpg
