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.
Forth Bridge. The Forth Bridge is a cantilever railway bridge over the Firth of Forth in the east of Scotland, 9 miles west of Edinburgh City Centre. It is considered an iconic structure and a symbol of Scotland.
Rakotzbrücke - also called the 'Devil's Bridge' is located in the Azalea and Rhododendron Park Kromlau - a park in the municipality of Gablenz, in the district Görlitz, Saxony, Germany (less that from the Polish border).