Hoover Dam: How 21,000 Depression-Era Workers Tamed the Colorado River — With 582 Miles of Cooling Pipe and Sheer Human Grit

In 1931, Six Companies sent 21,000 men into Black Canyon to build the world's largest dam — in the middle of the Great Depression, in 120°F desert heat, with no town, no safety net, and five years to do it.

A daily 1-minute video series uncovering how the world's most iconic structures were built — from ancient wonders to modern skyscrapers.