The Mike O’Callaghan-Pat Tillman Memorial Bridge constructed to divert traffic from the Hoover Dam has been described by many as one of the most spectacular concrete arch bridges ever built. The photo captures the spirit of the statement.

The project has not gone without controversy or incident. However, from a purely visual perspective, which is greatly intensified the backdrop, it's hard to argue that it’s not an absolutely amazing feat of engineering and design.

Building blocks over the Hoover Dam