Comment by jcims
6 years ago
Given their scale i think Hoover Dam and Golden Gate Bridge deserve honorable mention. (Five and four years respectively)
6 years ago
Given their scale i think Hoover Dam and Golden Gate Bridge deserve honorable mention. (Five and four years respectively)
There is the B-29. The US spent more money on that than the Manhattan project. I think the US spent even more money on radio and radar development during WWII.