Explore an incredible feat of engineering from above and below in this unique tour to Hoover Dam. With more than a million visitors each year, the Hoover Dam is a structure that holds back the mighty Colorado River forming Lake Mead and has been generating power for nearly 80 years. It's originally known as the Boulder Dam, and is located on the Arizona-Nevada border on Highway 93. It was built during the Great Depression and spans about 245 square miles of surface area. This first stop of this tour is the Hoover Dam Auditorium, where you can watch a film about the dam's history. Then take an inside look of the dam at your own pace, and see it from different angles on the Colorado River and the Mike O'Callaghan-Pat Tillman Memorial Bridge. Explore the power plant, as well, before proceeding to the last tour stop that is the Dam's Observation Deck.