stop near the railing and take a quick look over the side. It`s a stomach-wrenching shock. The concrete parabola of the dam drops away so far and so fast that just looking at it pulls you with it ...

Arizona has had its share of letdowns over ... The dam, at the southern edge of Wood Buffalo National Park in Northern Alberta, Canada, is more than twice the length of the iconic Hoover Dam ...

INSIDE HOOVER DAM — The floor rumbled under Mark Cook. His legs vibrated as he stood in a tunnel tucked into the thick base of Hoover Dam, 430 feet below the tourists looking out over Lake Mead.

Built over five years during the Great Depression and named after President Herbert Hoover, the Hoover Dam spans the Colorado River's Black Canyon at the border between Nevada and Arizona.

On this day in history, July 7, 1930, construction of the Hoover Dam began. Over the course of the next five years, more than 21,000 men would work tirelessly to produce what would become the ...