Hoover Dam is a massive concrete structure located along the Colorado River, straddling the border between Arizona and Nevada. Built between 1931 and 1936 with the help of thousands of workers, the dam stands as a symbol of American ingenuity. You can take a one-hour tour of the dam and the nearby power plant. Tour tickets can be purchased in-person at the dam. If you are short on time, the Bureau of Reclamation offers a power plant tour that lasts only 30 minutes.

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