![The Greatest Dam in the World": Building Hoover Dam (Teaching with Historic Places) (U.S. National Park Service) The Greatest Dam in the World": Building Hoover Dam (Teaching with Historic Places) (U.S. National Park Service)](https://www.nps.gov/articles/images/photo5cl.jpg?maxwidth=1300&autorotate=false)
The Greatest Dam in the World": Building Hoover Dam (Teaching with Historic Places) (U.S. National Park Service)
![The Greatest Dam in the World": Building Hoover Dam (Teaching with Historic Places) (U.S. National Park Service) The Greatest Dam in the World": Building Hoover Dam (Teaching with Historic Places) (U.S. National Park Service)](https://www.nps.gov/articles/images/highscalers3cl.jpg?maxwidth=1300&autorotate=false)
The Greatest Dam in the World": Building Hoover Dam (Teaching with Historic Places) (U.S. National Park Service)
![The Greatest Dam in the World": Building Hoover Dam (Teaching with Historic Places) (U.S. National Park Service) The Greatest Dam in the World": Building Hoover Dam (Teaching with Historic Places) (U.S. National Park Service)](https://www.nps.gov/articles/images/illustration1ch.gif)
The Greatest Dam in the World": Building Hoover Dam (Teaching with Historic Places) (U.S. National Park Service)
![The Greatest Dam in the World": Building Hoover Dam (Teaching with Historic Places) (U.S. National Park Service) The Greatest Dam in the World": Building Hoover Dam (Teaching with Historic Places) (U.S. National Park Service)](https://www.nps.gov/articles/images/photo6cl_1.jpg)