The US government has constructed at tremendous cost to its taxpayers some of the most impressive structures – both architectural and organizational – of all time. Yet somehow it has failed to build a viable wall on the Mexican border.
In 1931, during the Great Depression, the US government began construction of the Hoover Dam, one of the most ambitious civil engineering projects ever attempted. Employing thousands of US laborers, some 100 of whom reportedly lost their lives in the course of the project, the dam is mind-boggling due its sheer size, rivaling that of the pyramids.
At 726 feet tall, the wedge-shaped structure is 660 ft (200 m) thick at its base, narrowing to 45 ft (14 m) at the top, which provides enough room to accommodate a highway connecting Nevada and Arizona. The project required millions of cubic feet of concrete – said to be enough to pave a two-lane highway from San Francisco to New York – and tens of millions of pounds of steel.