Hoover Dam, Arizona/Nevada - Located in the Black Canyon of the Colorado River, the dam was built to impound Lake Mead and create the largest reservoir in the US by volume. During the construction from over 100 lives were lost.
Peace Bridge is a pedestrian bridge, designed by Spanish architect Santiago Calatrava, that accommodates both pedestrians and cyclists crossing the Bow River in Calgary, Alberta, Canada. The bridge opened for use on March
Golden Gate Bridge in SF ~ A Liquid Filter was used to make curves ~ Special Effects For An Amazing Bridge ~ However, in real like it would cost much more to build because of the extra length for curves, and would certainly slow the traffic down.