Hoover Dam at Lake Mead Nevada and Arizona Border USA

Completed in 1936, the 726ft-high Hoover Dam across the Colorado River remains an architectural wonder.

Guided tours drop deep into the facility and share details about its incredibly challenging construction. From an outdoor viewing area atop the dam, look back at Lake Mead. The discoloured “bathtub” rings on the surrounding red rock reveal how much the water level has dropped over the years. For a birds-eye view of the dam itself, which straddles the Arizona-Nevada state line, walk across the graceful Mike O’Callahan-Pat Tillman Memorial Bridge – but only if you’re not afraid of heights.

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