Though it may not get the attention that, say, the pyramids of Egypt or the Empire State Building get, the Hoover Dam is one of the unheralded wonders of the modern world, a massive edifice of over 3.25 million cubic yards of concrete and 582 miles of cooling pipes that provides the West with 4.2 billion kilowatts of energy a year.
Source:
http://www.life.com/image/88469255/in-gallery/45961/building-the-hoover-dam
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