Built in 1936, this monolithic structure remains one of the most impressive engineering accomplishments in the US. Standing 726 feet (221 m) and 1,244 feet (379 m) wide, this concrete behemoth is responsible for the control of water flow from Black Canyon as well as power generation for the three states surrounding it. Your tour to the Hoover Dam will include fantastic views from the visitor's center, perched neatly atop this magnificent structure. You will also have the opportunity to tour the dam's interior. Take an afternoon away from your Las Vegas vacation and let Grand Canyon Coaches take you to one of the most impressive constructions in the country.