Just off Route 66 in Black Canyon, which spans the Colorado River on the border of Arizona and Nevada, is the Hoover Dam. It was built during the Great Depression in the 1930s to produce hydroelectric power and provide irrigation water, and the dam is a National Historic Landmark and has been rated as one of America's Seven Modern Civil Engineering Wonders. Some quick stats about the Hoover Dam: it is 726 feet tall from foundation rock to the crest of the dam, it weighs more than 6.6 million tons, and it required more than 5 million barrels of cement to build the dam. To see it in person is is awe-inspiring...it is a massive, yet beautiful structure, and it's a mind-boggling piece of architecture.
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