A Depression-era engineering miracle that holds back the Colorado River and powers most of southern Nevada. The 35-minute Powerplant Tour gets you down into the dam itself; the Dam Tour gets you deeper still, through tunnels and ventilation shafts that feel like a Tom Clancy novel. The scale is impossible to grasp from photos. Go.
Insider tip
Book the Dam Tour, not just the Powerplant Tour — it's the one that takes you deep. Drive across the dam, then walk the Mike O'Callaghan-Pat Tillman Bridge for the view.
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