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The Hoover Dam is an American Historic Landmark, standing at a height more than 726 feet above the Colorado River; it is the highest concrete dam over the entire western hemisphere. There are many optional Hoover Dam tours available from Las Vegas, just 30 miles away; if you wish you can extend your itineraries by adding many other exciting places nearby, like, Grand Canyon tour, Skywalk, Grand Canyon South Rim or a helicopter ride over the whole place.
from: http://ezinearticles.com/?Who-Built-the-Hoover-Dam?&id=5818573
