Named one of the Top 10 Construction Achievements of the 20th Century, Hoover Dam continues to draw crowds 80 years after its creation.
  Attracting more than a million visitors a year, Hoover Dam is located in Black Canyon, just minutes outside of Las Vegas.
  The dam is named after America's 31st president, Herbert Hoover, who played a large role in bringing the nearby states into agreement about water allocations, settling a 25-year controversy. The dam has been called Boulder Canyon Dam as well as Boulder Dam, but Hoover Dam was reinstated as the official name by Congress in 1947.
  The view from the dam also offers a breathtaking look at Lake Mead, the country's largest man-made reservoir. Although water levels have been low recently, Lake Mead can store up to 9.2 trillion gallons of water, equal to two years of the river's annual flow. It also has become a popular recreation area, sought out by more than 9 million visitors each year.